Alice has never really been in love with anyone else but Bob. She can only be attracted to/aroused by him, not even other men, or, for that matter, women. Not even porn can do it for Alice, unless Bob is in the porn. If Bob turns into a girl, Alice will still be hot for her. If Bob is technicallymore than one person, Alice will love all of them, to the exclusion of everyone else that does not inhabit Bob's body. The only way you can describe Alice's sexuality is "Bob-sexual".
Sometimes a serious character type, sometimes a joke said by Charlie to describe Alice's infatuation with Bob. Sometimes it gets to the point where Alice becomes a Stalker with a Crush or something similar.
May be Fan-Speak. See also If It's You, It's Okay for when the target is outside of the character's usual sexual preferences; in both cases it's often a way to give a character who isn't normally seen as having 'sexuality' a romantic interest. Most shippers tend to believe their OTP is affected by this.
Disinterest in attractive people of an appropriate gender, other than one's love interest, is commonly shown as an indication of being deeply in love; whether this is Truth in Television varies between couples.
Not to be confused with Single Object Sexuality or Object Sexuality in general.
open/close all folders
Anime & Manga
The manga Ai Kora appears to be this series main plot, as the main character Hachibei Maeda only finds attraction in women who have his "Ideal Parts". He shows no interest in women who do not have these parts.
Edward Elric from Fullmetal Alchemist never shows the slightest interest in any girl but his mechanic, Winry, the girl he eventually marries. May be a genetic trait, as there's no evidence that his father, Hohenheim, ever loved anyone but Trisha despite living for 400 years.
Manabu Tanaka and Reina Ryuuzaki from "Yandere Kanojo" are a Single Target Couple beyond question.
Chi-Chi is Goku-sexual in Dragon Ball when they first met. When they meet again 5 years later in the World Tournament (despite him not remembering that she is Chi-Chi), and married. Despite Goku being dead for 7 years, she never remarried, and they fully reunite after Goku once again comes Back from the Dead after the aftermath of the Kid Buu arc.
Boa Hancock from One Piece despises all men and is indifferent to most women; however, when it comes to Luffy, she has made it explicitly clear that no matter what the circumstances, even if he was the son of demons, she'd still love him.
Kaede's life revolves around Rin in SHUFFLE!, largely as a result of the desire to atone for her mistreatment of him when she blamed him for causing her mother to come home early and die in an accident (when, in fact, her father had called her mother when she had fallen ill), though the ending of the anime implies that she hooks up with Sia.
Kampfer's Natsuru Senou. Oh Natsuru, you practically drive the plot with the fact that despite having a harem of girls who love you and your crush is a Psycho Lesbian, you still remain Kaede-sexual.
Tamaki loves only Haruhi, though he has a tendency to flirt with anything in a skirt.
Haruhi's father is technically bisexual but has decided he could never love another woman as much as he did Haruhi's now-deceased mother, and thus is effectively gay.
Itsuki from YuYu Hakusho is "Sensui-sexual". He even loves all of Sensui's personalities, no matter how vile. His official favorite is Shinobu, the original one, although Naru - a young girl who is naive and innocent - comes in second. It's worth pointing out that Itsuki's manga version talks about how he started hanging around young Sensui because he knew the other would break eventually and he loves to see pure things shattered.
"Like a little girl who thinks babies come from storks growing up to star in porno films. I love that kind of thing."
Amane Misa from Death Note can be described as "Kira-sexual" or "Light-sexual". (Although if she had to choose one or the other, she'd choose Light.)
Fandom has described Subaru in X1999 and Tokyo Babylon as "Seishirou-sexual" and vice versa, though it's pretty common for CLAMP characters to pick one person and stay with him or her for their entire life.
In the same series, since Mikoto has No Social Skills, it's very hard to pin down the object of her affection (if she even has one), but given her protective nature toward the protagonist, she can best be described as "Mai-sexual" (pun intended).
Potentially Natsuki toward Shizuru, as Natsuki's interest in her and main reason for considering her the most important person in her life is her reaching out to her when she couldn't trust anyone. In HiME, conversely, Shizuru is very clearly interested in Natsuki to the exclusion of anyone or anything else.
An even more specific variant of this trope appears in Kamen No Maid Guy, where the Leader of the Naeka's breasts fanclub only has eyes for her... or at least her chest. Strangely, Naeka finds this almost romantic. After he's put through Easy Amnesia (for the second time that episode), he reverts to normal, and his eyes are no longer on Naeka only.
Yuki, who is, for all intents, a pre-op M-t-F transsexual, in No Bra doesn't seem to have any sexual interest in girls and has flat out said she doesn't like boys in that way. In her own words, "It's not that I like boys. It's only because the only person I love is a boy." She's in love with her childhood friend, Masato, and seems to be physically attracted to him.
At the end of the manga, she momentarily seems to switch from Masato to her actual childhood friend.
Souichi from The Tyrant Falls In Love is most likely "Morinaga-sexual," despite being utterly in denial about it; he states on more than one occasion that he puts up with Morinaga's sexual advances because he's Morinaga, and that not even blackmail will make him tolerate having sex with anyone else (and yet he manages to overlook the painfully obvious implications of this...). Admittedly, Souichi is a rabid homophobe, which would make him heterosexual by default and his relationship with Morinaga more of an If It's You, It's Okay situation...if any sign was shown of him being interested in anyone else, male or female, much less having any friend other than Morinaga.
In Zetsuai1989, Nanjo Koji is Izumi-sexual, having fallen in love with him at first sight and Izumi being the only person he ever felt emotion for. When they coincidentally meet again years later, Koji all but stalks Izumi and declares to another prospective love interest that even if said love interest was Izumi's twin, he would still love only Izumi.
Tomoyo's eyes did briefly wander over to Touya, after Tomoyo noticed that he and Sakura "have the same lovely ears", thanks to a Relationship Writing Fumble where the writer of that scene didn't know that CLAMP intended Tomoyo to be hot for Sakura, and so they spun it that she only crushed on Touya because he reminds Tomoyo of Sakura.
Hinata Hyuga from Naruto is "Naruto-sexual", as a result of her admiring Naruto's persistence and determination, and having become more self-confident as a result of his influence.
Karin is very much "Sasuke-sexual''.
Obito is very much "Rin-sexual". To the point that he willingly joins Madara after she is killed purely to make a dream world where she is alive again, instead of moving on like any normal person should.
Prince Diamond only has eyes for Sailor Moon, and he greatly desires for her to feel the same way about him. It's tragic in the anime since he's an Anti-Hero, but in the manga he's pure evil. The musical plays up both sides of his personality, including one scene where he's singing his character song while Sailor Moon is lying passed out on an altar. He later turns into a complete monster.
Michiru and Haruka are eternally devoted to each other; rarely expressing interest in any other woman. The latter qualification is because Haruka sometimes uses her Bifauxnen looks to play The Tease with the other girls.
Kagami from Lucky Star can be described as Konata-sexual after seeing her character song 100% nai nai nai, the OVA and the Pocket Travelers manga.
Although Chizuru from the Hen manga has sex with men often, the only person she has ever fallen truly in love with is Yamada — a girl who transfers into her school.
Chinese Amazon Shampoo of Ranma ½ could conceivably be dubbed a "Ranma-sexual". She has absolutely no qualms whatsoever over embracing, dating or otherwise being affectionate towards her reluctant Gender Bender fiancee no matter what form he's in, despite the fact that she canonically called Akane a pervert whilst insinuating that Akane was really a lesbian in love with Ranma's cursed form. She displays no interest in any other man, even men who manage to prove themselves as being stronger than Ranma.
Gotta wonder if this the case with the Mobile Suit Gundam SEED franchise's Athrun Zala. Even after the Ship Sinking with his original love interest, he ignores or fiercely resists the romantic advances of the several attractive girls throwing themselves at him. Some like to call him loyal, but judging by his Heel Face Turn track record, this trope is probably closer to the mark.
Despite what the Yaoi FangirlFandumb will try to tell you, Heero Yuy is this to Relena Darlian, although it's hard to tell given his personality. It is clear that Relena is FAR FAR ahead of any other characters though, sorry fangirls.
Soifon from Bleach has eyes only for her Yoruichi-sama.
Orihime once said that if she were reincarnated five times and lived five different lives, she'd fall in love with Ichigo every time.
Fred Lou for Gene but you probably didn't know because you watched the dubbed version. He's either a Gene-sexual metrosexual or he's Camp Gay and happens to have a crush on Gene, if you note his mannerisms and the way he speaks in the English dub. As far as the original goes, Fred is a Camp Gay who doesn't even tries to hide his affections. Gene is adamantly straight, but does tolerate Fred's advances because he's his friend.
Chizuru from Kanokon is like this (Shotacon) for Kouta. It actually becomes in some ways rather disturbing, as Chizuru looks like a voluptuous young adult, but Kouta has a rather boyish appearance about him, so it's sexually inexplicit shotacon. It also frequently gets turned up to near Rape Is Love levels by Chizuru with elements of Double Standard: Rape—Female on Male thrown in.
Implied to be the case with Yahiko toward Tsubame in Rurouni Kenshin after his feelings grow from a crush to something more. Outright stated in the second extra chapter after the end of the manga where Kaoru sends Yahiko on a month-long mission teaching at a friend's dojo while the owner was away. Said owner, concerned about leaving his very pretty daughter alone with his male students, asked Kaoru for help. The reason she sent Yahiko was because she knew Tsubame was the only girl for him and that he wouldn't even think about any other girl, much less do anything untoward. She even says this right out to Yahiko, much to his sputtering embarrassment. As expected, he shows no attraction for the daughter and, upon his return, immediately heads off to see Tsubame with Kaoru again restating her previous observation.
Pretty strongly implied with Misao toward Aoshi. She's loved him (one way or another) since her early childhood and is still very focused on him even in the manga's final arc. Of the series's four female protagonists, Misao alone never expresses interest in Kenshin (though she admits that Enishi is "finer of face than she expected" in the Jinchuu arc).
Yuuki from Kanamemo is Yume-sexual. She seems especially pleased at the idea that Yume, being born with a silver spoon in her mouth, would always be a kid, making it so that Yuuki would have to take care of her forever.
Prunus Girl: Aikawa is the only person who ever gets a reaction out of Maki, who is otherwise completely uninterested in "girls". He "deals with" one love letter off-page, thinking that ever since starting high school *cough* those letters failed to get him worked up, and obliviously brushes aside the last attempts of another girl to get his attention.
The original Japanese version is much more blatant with this, while the English version tries to make it seem more like passionate loyalty. It doesn't work.
Yami to Boushi to Hon no Tabibito has a debatable case of this with Hazuki. It's pretty clear she's a lesbian, but the only one she has eyes for is her adoptive older sister and best friend Hatsumi, to the point that she automatically trashes a gift given to her by an akogare-ing classmate within 5 minutes of the start of the first episode.
Congratulations, Miaka/Tamahome shippers—not even Soi's talents could tear Tamahome away from his lady love.
Chizuru in Seitokai no Ichizon claims this when asked about the kind of person she likes: Kurimu and only Kurimu.
Kagura Sohma is disturbingly attached to her cousin Kyo, and tends to express her psycho-love through violence. Then she'll snap out of it and go ultra-dere before abruptly switching back to pummeling the poor guy. She extracted a Childhood Marriage Promise from him by threatening his life, for Pete's sake! Though she later realizes that her love for Kyo stemmed mainly from her belief that loving him would make up for her earlier horrible behavior towards him and willingly concedes him to Tohru, the mangaka herself says that a part of her will always love Kyo.
Tohru herself never shows romantic interest in anyone besides Kyo, eventually proving that she loves him even when he's a cat or a foul-smelling monster.
And Soul's attraction to Maka takes the cake, what with Soul dismissing any and all girls that wish to be partners with him even after becoming a Death Scythe and not technically needing Maka anymore. It even reaches a point where he manages to fight off his insanity without Maka's help for her.
From Pokémon Special, most fans generally agree that Yellow is canonically Red-sexual. The Pokémon Fan Club President, though not speaking of romantic manners, at one point wonders, "Is Red all this kid thinks about?"
Same thing with Ruby and Sapphire. They had fallen in love when they were kids, and changed their personalities for each other. When they remeet and manage to not recognize each other, they end up falling in love with each other all over again. Not even Team Magma Admin Courtney's apparent interest in Ruby could tear his eyes away from Sapphire.
In Magical Girl Lyrical Nanoha, Subaru is often identified by fans as "Teana-sexual". Others assume her adoration of Nanoha has a sexual dimension and thus see her as just a lusty lesbian.
Nanoha herself is sometimes seen as Fate-sexual. Fate has also been seen as Nanoha-sexual.
The anime version Sasame from Prétear is a bit of a flirt, but when it comes right down to it he's Takako-sexual. After falling in love with her and failing to tell her before she became the Princess of Disaster, he pined after her for 16 years and eventually abandoned his friends and everything he believed in for the chance to be by her side. The manga version of Sasame is described as a "playboy" however.
Yuki Nagato from The Melancholy of Haruhi Suzumiyamay be Kyonsexual. She speaks to no one except him on any regular basis, has promised to protect him, and told Kyon in a dire situation that she would regret losing him. Once, she even rearranged reality so that she could live a normal life, and the new world essentially set up a romance between Kyon and Yuki.
It's more likely that because she is still learning to express emotions, she's attracted to Kyon over other boys simply because of their established relationship. When Nagato briefly thought she had a secret admirer, Kyon thought he might have seen her show a hint of disappointment when she discovered it was a misunderstanding.
It's pretty surely established that Yuki is head over the heels for Kyon. It's the question whether she's able to love anyone else is up in the air.
In Get Backers, the Ax CrazyPsycho for Hire Takuma Fudou can certainly be described as "Ban-sexual." He shows a lack of interest in anything non-Ban related, and any time he so much as senses Ban's presence, his "mind goes blank," he gets very excited and starts feeling a "throbbing desire." Countless times, he screams at Ban to "give his body to him" and "meet his desires." He also shows great resentment and jealousy towards Ginji (whom he claims he dislikes because Ban ignores him when Ginji is around), as well as Hevyn.
In Keroro Gunsou, Momoka is clearly Fuyuki-sexual; when she thinks that he's been turned into a girl (it's actually his mother aged down by Kululu, long story), she's completely okay with it. Tamama could also be said to be Keroro-sexual.
Giroro and Koyuki are both Natsumi-sexual. More prominent in the manga with Koyuki, though.
Durarara!!'s Shinra is a very vocal Celty-sexual, claiming that, were she not to exist, he would probably be asexual. Celty, for her part, is worried that he might be Dullahan-sexual, and dreads another one showing up and stealing him away.
Usui Takumi in Kaichou wa Maid-sama! seems thus far to be terminally Misaki-sexual. Not only is he notorious for turning girls down at the beginning of the series, once Misaki piques his interest he doesn't seem to have more than a passing interest in other people at all except so far as how they relate to Misaki.
In Sensual Phrase, both Sakuya and Aine are like this for each other, though Sakuya is more extreme about it.
Despite being in a harem manga, and clearly Genre Savvy about it, Miki of Hayate the Combat Butler has only shown interest in one person, Hinagiku. She's even gone so far as to tell the one who's the center of the (main) Harem, that she has no interest in him.
On the other side of the wagon, Kotetsu Izumi's older brother has been shown to have no interest in anyone but Hayate. This may simply be that we haven't seen any interest being displayed beyond that in Hayate and trains.
B Gata H Kei is filled with many characters who have this. Both Kosuda and Keiichi are Yamada-sexual, Kyoka is Keiichi-sexual, and Mayu (and eventually Yamada) is Kosuda-sexual.
In Kimi ni Todoke, Sawako and Shota are both like this for each other.
Apparently, the author actually dubbed Sweden as "homosexual for Finland" in his old notes. They were very old notes though, and aren't around anymore, so the situation might be different now.
Spain could, from an angle, be viewed as "Italiasexual". He's proposed to both of them, is extremely affectionate to Romano and thinks Veneziano is adorable, and yet doesn't show much of this to any other characters. Could be because he's not shown very often, or because not many of his relationships have been shown, but as of now it looks like this...
One joke/explanation for Germany/Italy shippers is that the usually stoic Germany is Ita-sexual.
Come on, you guys forgot that Holy Roman Empire is Ita-sexual? Some fans will tell you this doesn't count because of the Germany-is-HRE theory, making this a double-submisson. If I recall correctly:
Holy Roman Empire: No matter how many hundreds of years go by, I'll always love you more than anyone in the world!
In Bakuman。, Miho Azuki has never been interested in anyone other than her classmate Moritaka Mashiro, as she has been attracted to him since fourth grade.
From all indications, Firo from Baccano seems to be Ennis-sexual, despite the fact that she takes a long timeto catch on. Though they're both immortal and have plenty of time, there's still something to be said for the fact that Firo waited fifty years for her to agree to marriage, and though they're now living together hasn't tried anything.
Illsaide from Vampire Game seems very much to be this way towards Ci Xeneth's princess Falan, even after it's discovered that he's her half-brother via her father Jened and the Lord of the Sea's daughter, making him half sea monster as well.
However, Illsaide shows some attraction towards Duzzel in his Ishtar form for a little while. Even going as far as kissing Duzzel.
Lum of Urusei Yatsura is Ataru-sexual, having eyes for only her "Darling" in spite of him being the biggest lech in the galaxy and constantly running away from her to hit on other girls, and every single other male around her age being enamored with her.
Belldandy of Ah! My Goddess towards Keiichi. Especially applicable in that Keiichi was once gender-flipped into a woman, and Belldandy didn't care a whit (except caring in that Keichii himself was somewhat dismayed).
Randoll of Future GPX Cyber Formula is completely Asuka-sexual, and he doesn't show interest in anyone other than her. He does tries to flirt with Rena in the PlayStation game, due to being similar to Asuka (but ultimately fails).
Andre Grandier of Rose of Versailles loves Oscar and nobody else. Likewise, Rosalie is also this towards Oscar, although she hooks up with Bernard at the end of the series, but still has some longing for Oscar.
Possibly Chiba from Wandering Son. In the several years from 5th grade to high school she has shown no signs of liking anyone but the protagonist, whom she likes no matter his gender (though she seems to prefer him as a boy).
It might be more accurate to say that she's Misaka-sexual, since she also though Mikoto's mother was a hottie. Let's just pray she never finds out about the clones...
Even after having her memories of Mikoto removed her heart starts pounds and she begins blushing at the mere sight of her
In Karakuridouji Ultimo, Rune toward Yamato, by way of Reincarnation Romance. As a result of his gender changing, he goes from being a heterosexual girl in the past to a homosexual boy in the present, but still longs for the same person.
Gui from Half Prince has stated that he would like Prince no matter the gender or age. He's not homosexual, he's Prince-sexual.
Silver Diamond 's Chigusa will forever be Rakan-sexual. (And considering he's immortal, that is very literal.)
Luka from Uragiri wa Boku no Namae wo Shitteiru is this way towards Yuki. The fact that the pretty girl he fell in love with is now reincarnated into a male body does nothing to discourage him in his unfailing loyalty and devotion.
Reinforced even further in one of the OVAs, where for once he's shown being attracted to a girl...who's actually Akihisa crossdressing. He then spends the rest of the OVA torn between Akihisa and Mystery-Girl-Who's-Also-Akihisa.
Faust VIII from Shaman King is most decidedly Eliza-sexual.
Lucy/Nyu of Elfen Lied is Kouta-sexual even if she does tend to initiate Les Yay with other girls.
Naruse from the yaoi manga Kawaii Akuma and its sequel is definitely Akiyoshi sexual.
Tsukune of Rosario + Vampire is Moka sexual. And Kurumi and Mizore are both Tsukune sexual.
In Hot Gimmick both Shinogu and Ryoki are Hatsumi-sexuals.
In Gravitation Shuichi is Yuki sexual and Tatsuha is completely and utterly obsessed with Ryuichi. Whether it's faking illnesses or dressing up in an animal suit, Tatsuha will do anything to get Ryuichi. Unfortunately for Shuichi, if Tatsuha can't get his hands on Ryuichi he forces his UST upon Shuichi as Shuichi resembles Ryuichi.
To Love-Ru: Momo ignores all the guys who hit on her at school and only looks at Rito. Even when he changes gender, Momo doesn't seem to mind.
Tatsuya of Hekikai No Aion is Seine-sexual. Being the Nice Guy, he doesn't show any kind of attraction to any other girl who isn't Seine; and he has other options that he already knows love him, but still, his eyes are upon the kuudere Seine so much that he may cross the line and almost opendly be a Lolicon for her 8-year-old form when he go intro her dreams of the past.
Medaka Box: Besides Rule of Funny, Zenkichi Hitoyoshi has been Medaka-sexual for nearly his entire life(they have been together since they were a year old).
And she has been in love with him for just as long. In an interesting twist on this scenario, despite them both being cognizant of each others feelings(after some inevitable dancing around), Medaka has tried to get with Zenkichitwice and he has turned her down both times(the second time was just poor timing on her part really, he would have said yes had she asked even 6 months earlier by his own admission).
Suzuka: Yamato even when in other relationships, is obsessed with her. In the manga, he turns down other women who are interested in him, and flat out refuses sex because of his obsession.
Jack from Pandora Hearts has only ever expressed any sort of attraction toward Lacie, though he straddles a very thin line between love and full-on obsession. Vincent, who's always sleeping around with various noblewomen for his own personal gain, has only been shown to be truly passionate about Gil.
In Camelot 3000, when Sir Tristan is reincarnated as Lady Tristan, it causes her considerable distress and confusion. But Isolde (reincarnated as a woman, as in her first life) has no confusion at all. She's in love with Tristan, regardless of Tristan's sex.
This is prevalent in TOS-verse Kirk/Spock slashfic, in that Spock was not a sexual being outside Pon Farr except where Kirk was concerned. Actually, the same could be said for Spock/McCoy fanfic as well.
Axis Powers Hetalia fans sometimes dub America as "Iggysexual" towards England and vice versa, mainly because they're a very popular Fan Preferred Couple (and it not being that hard to see America as being Tsundere for England only); ditto with Romano as "Spain-sexual". Japan is also sometimes depicted as being "Greece-sexual" with Greece as the only nation he can overcome his emotional reservedness and intimacy issues with.
Subaru is described by Nove as "Teana-sexual" in Relationships Series, and her older sister Ginga asks if she'd be attracted to Teana even if she were male.
A couple of this author's stories take this trope to a ludicrous extreme, whereby every single character in the story appears to have Single-Target Sexuality for... whoever the main character is. Even the Pokemon!
This Scream fanfic as an OC that seems to be Charlie sexual. Early on, it's hinted he's the only person to stir her....that way. She's seventeen at the time. Later on, when she starts dating someone else he does nothing for her and she's still stuck on her friend. Yeah, it's weird
Many, MANY Sherlock/John fanfictions from the BBC show fandom have this implied or used in their works. Sherlock is generally regarded as asexual, unless it's John, so, "John-sexual." John is generally heterosexual, unless it's Sherlock, so, "Sherlock-sexual."
Whether or not Koizumi Itsuki fits this trope depends on the chapter of You Got HaruhiRolled! you are reading. Most of the time, he shows attraction to Kyon, and in one chapter explicitly calls himself Kyonsexual, in other chapters he exhibits his Abridged Series characterization, where he is equally shamelessly a Lolicon. Further confusing matters is that in one Spin-Off chapter he does an entire song-and-dance routine about being straight all along. Far less ambiguous is Kyouko's lesbian crush on Sasaki, which has held for all chapters, except possibly for a gag in the court case arc where she states that she is not a virgin.
Jamal from Slumdog Millionaire spends years looking for Latika after they are separated as children.
And going the other way, Sweeney is Lucysexual. He escapes from prison to find her again and, upon learning she drank poison, sets about killing Judge Turpin to avenge her memory. And when he finds out that he accidentally killed her, he willingly lets Toby slit his throat.
Edward Bloom of Big Fish for his wife. As the Unlucky Childhood Friend says of him: "For Edward, there are only two women in the world. His wife, and everybody else."
Forrest Gump never seems to notice any women other than Jenny, from when he was a kid.
In Elektra Luxx, Holly invokes this trope as she declares her love for Bambi.
This is common in racy romance novels. If the heroine is not a virgin, all her sexual experience before the hero will have been extremely lame to horrible. When she and the hero have sex, on the other hand, it will move mountains and cause tidal waves. This is used to underscore how perfect they are for each other, but they often feel a strong attraction well before they acknowledge the romance.
It's the same for the hero. She's usually not his first, but she's the first/only one he loves and sex with her is the best sex ever for him too.
In Flowers for Algernon, when all of Charlie's sexual experiences are passionless, confusing, or painful until he has sex with Alice Kinnian, the only woman he's truly loved.
Edward Cullen of Twilight, despite having lived for over 100 years as a teenage vampire at the age when males should be at their most sexually curious, has never been interested in any girls. Then he meets Bella, gets a whiff of the delicious scent of her blood, and becomes a committed Bella-sexual.
Also occurs with Jacob Black, who follows Bella around and remains in love with her no matter how many times she tries to let him down or how married she might become. He insists to Bella that he will never imprint on anyone because he never even sees anyone but her. Jacob even drives around town trying to interest himself in other girls but it does not work. Switched up later, with the birth of Renesmee, when he imprints on here, and becomes Renesmee-sexual instead of Bella-sexual.
There's some implication that Jacob had in fact always been Renesmee-sexual, and had in fact imprinted on her before she was born but thought he had imprinted on Bella.
We could add Bella herself to the mix as well, being mostly Edward-sexual with a little side of Jacob-sexual. There's no indication that she was ever interested in anyone before moving to Forks.
This is pretty much par for the course of the Twilight series. Once the characters find their significant other, they never even look at another member of the opposite sex. This is taken to ridiculous extremes with Alice, who becomes Jasper-sexual after having a vision of him, years before she even met him. And the entire concept of imprinting centers around a werewolf becoming utterly devoted to a single woman, speculated to be the one best suited to having his children.
In Lois McMaster Bujold's Barrayar books, Aral Vorkosigan is an interesting variation: he's attracted to other men — and to Cordelia, the woman he loves.
A Song of Ice and Fire: Jaime Lannister has, according to him and to the best knowledge of the reader, only ever loved/had sex with his twin sister Cersei, to the point where he's disturbed when he experiences attraction to another woman. Not so much the other way around (to quote Tyrion, "No one can say that my sister does not love her family").
Well, she sure knows how to use the power sex gives her over men - and women. But for her it was "never any good with anyone but Jaime".
Chronicles of the Kencyrath: The heroine Jame and her twin brother Tori only seem to get sexual feelings for each other, though it's only gone as far as shared highly sexual dreams and one kiss. (Word Of God says it's going to go a lot further than that.)
In Harry Potter, Severus Snape has never gotten over his devotion to his childhood friend Lily Evans, even decades after she assured him that she loathed him.
Ginny is a mild example of the trope. Late in the series, she admits that she started to date Michael Corner largely to get over Harry, who at the time was not romantically interested in her but in Cho Chang. Before Harry finally sees the light, she also dates Dean Thomas. But from the time she first saw Harry when he was eleven and she was ten, he was always first in her affections.
Orlando by Virginia Woolf demonstrates in passing that this is not a good thing for an Abhorrent Admirer to have, as even a Gender Bender fails to get rid of him.
Justine in The Dresden Files is Thomas-sexual. However, this is originally less about love and more about the fact that an Emotion Eater is about the only thing that can keep her mental illness under control. And while they finally admit they're in love later ... well, Thomas is a White Court vampire, so The Power of Loveburns him. Ouch.
Although Justine eventually realizes her Thomas-sexuality can be used a solution to that particular issue.
In the Codex Alera series, the extremely attractive and strong Marat woman Kitai is Tavi-sexual. Justified because the Marat form deep pair-bonds with an animal, and she bonded with Tavi by mistake. In fact, this was Played for Laughs when Kitai was initially annoyed and said "I wanted a horse."
In the Incarnations of Immortality novel Being A Green Mother, a succubus chooses to focus her intense sexual drives on one member of a particular rock band. This is aided by unique properties of the magical Jonah's Whale (yes, that Jonah and that whale).
"Some men want any redhead in general, and some want one redhead in particular. Those who want a redhead in general have their fun and go their way. But you ... you want one redhead in particular. And I'm not her."
In the Charles de Lint novel, Memory and Dream, the deceased Kathy describes herself as not being gay or straight, she doesn't love anyone else, just her best friend (and protagonist) Isabelle...who is, if not precisely homophobic, definitely very straight.
Alec in Lynn Flewelling's Nightrunners - he has quite a narrowed taste. Before he and Seregil achieve the Official Couple level he sleeps only with women (one precisely) who remind him of Seregil. If you're not dark brunette, slender and blessed with a face that at least vaguely resembles Seregil you either stand no chance - or you need magic to get into Alec's pants.
Peeta Mellark from The Hunger Games is Katniss-sexual. He fell in love with her when he was just 5 years old and heard her singing - at that moment he "knew he was a goner." He presumably went on to love her for the rest of his life (in the epilogue they were married and had two children) even overcoming the fact that he was tortured and brain-washed to hate her by the Capitol while captured.
Peeta might actually be a subversion. He tells Katniss that he noticed a lot of other girls but none of them made the same impression as she did. He also seems to be somewhat attracted to Johanna Mason.
The Kantri of Tales of Kolmar tend to be like this since they mate for life. One fell in love with a human despite the species barrier, and although he'd have been happy to see her as another Kantri, he found her beautiful despite the strange form. Conveniently he ends up human. In a later book Will is sought after by many women, but finds this annoying and only has eyes for Aral.
Nawat from Tamora Pierce's Trickster books is Alysexual, possibly because he's actually a crow who was turned into a human and real crows mate for life.
Lifebonded couples in Mercedes Lackey's Heralds of Valdemar books are a variation of this. They may have been with others before they find their lifebonded, but afterwards they are definitely single target sexual. Additionally, any previous lovers are usually dismissed as casual sex/ pretty meaningless.
Stefan to Vanyel: "All - all I can tell you is that I think I'd love you if you were a hundred years older than me, or a deformed monster, or - or even a woman."
Vanyel is definitely this trope. Until Stefen shows up, his One True Love has always been Tylendel, his deceased first lover. In the intervening twenty or so years between Magic's Pawn and Magic's Price, the books indicate he's had only a handful of lovers - several of which were women who wanted to get pregnant but for whatever reason couldn't (One of whom was the Queen. The King was sterile.) It's heavily implied that Stefen was the reincarnation of Tylendel. Vanyel is so 'Lendel-sexual that he only falls in love again when the object of his attraction is reincarnated. That's dedication.
Darryl of Heart in Hand is Alex-sexual: not only did he never have any sexual interest in anyone until he ended up sleeping with his hockey rival on a regular basis, but he confirms through an experiment that he literally can't get it up to the thought of anyone - female or male - other than Alex.
In Across The Universe, Harley only ever loved his girlfriend, Kayleigh. He took her alleged suicide very badly, staying up all night to madly paint, and likes Amy so much because her red hair reminds him of koi (Kayleigh's favorite type of fish). Elder also becomes Amy-sexual, fascinated by her exotic appearance and free personality, which is unlike nearly everyone on the ship.
Live Action TV
Although he once speaks of having had other girlfriends, Ned from Pushing Daisies only has eyes for Chuck, at one point telling her plainly that she's the only one for him. It's even lampshaded in "Smell of Success":
Emerson: Hell, before dead girl came along I didn't know what you liked or if you liked or if you had anything to like with. For all I know you could've been one of those people who was born with both but didn't use either.
Dick Solomon of 3rd Rock from the Sun seems to be "Mary-sexual". Subverted in the third season when they broke up and he noticed other women for the first time.
This is actually more of an aversion of this trope. From the beginning Dick was deeply interested in Mary, but any time they're not actually a couple he displays physical attraction to other women. There's also a period where he's having fantasies about Nina (and stupidly discusses it with Mary and Nina). However, he's only ever been in love with Mary and the few relationships and attractions he's had to other women have never been as powerful or important to him as her.
Ianto Jones from Torchwood seems only capable of having infatuation with one person at time, which (might?) explain why he doesn't actually consider himself bisexual.
Ianto: It's not men. It's just him. It's only him.
With the possible exception of the strip club audience of the first sketch, the only people ever shown being attracted to Mango are people normally attracted to women (otherwise-straight men, and Ellen DeGeneres). So... maybe he produces female pheromones?
Except not, she's now with Zeke, and her Justin-sexual behavior has toned down greatly.
Willow from Buffy the Vampire Slayer, a lesbian, comments that she didn't first discover herself attracted to "women," but to one "woman" — her first girlfriend, Tara. (Indeed, some fans were a bit annoyed at first by their relationship, as before this Willow had always been shown attracted to men.) After Tara's death, Willow eventually shows attraction to other women and gets a new girlfriend.
Another odd example with the same character: one episode features a boy who has a magical jacket which causes any woman who sees him wearing it to fall madly in love with him. And it does work on Willow, too, leading to several amusing jokes when she and the other girls start fighting over him.
Steve Urkel from Family Matters is a Laura-sexual for most of the series, though he does get another girlfriend later in the series who ironically turns out to be Urkel-sexual.
Not quite present with Monk, as he has been attracted to a few women, and is technically probably asexual, but he still considers himself married even though his wife is dead, and the idea of actually being interested in another woman is quite a frightening prospect to him.
Happened to Chuck Bass on Gossip Girl. He may have been a healthy seventeen-year-old at the time, but neither the "erotical nor the pharmaceutical" did any good. If it wasn't Blair, it wasn't working. For this, Serena dubbed him "the eunuck".
Rory from Doctor Who is a raging Amy-sexual. So much so, that he is Mistaken for Gay... by Amy (she assumed he was gay because, though she'd known him since childhood, she'd never seen him show interest in girls. Turns out it was because from the beginning he'd only wanted her.)
There's a comic in which Amy and the Doctor are bodyswapped. Amy once comments that they'd better get this fixed or certain things◊ on and off the marriage front will be difficult, but after initial brainbreak Rory starts treating her and the Doctor exactly as before, down to holding Amy when Time Lord senses start overwhelming her and calmly threatening the Doctor when he does something that seems counter to Amy's long-term well being. At the end of the issue he says he doesn't care what she looks like, he loves her, and passionately kisses a Time Lord... but they've switched back. He's the last to know.
Whether intentionally or not, The X-Files has Mulder (of all people) becoming this towards Scully. In early seasons, Mulder would hit on other women, make lecherous comments, etc. By the end of the series, we hadn't seen that in quite awhile—it was all directed at Scully. It becomes a hilarious (and cute) plot point in the 2008 movie "I Want to Believe." The young agent who requests Mulder and Scully's help on a case develops (or already had, it's unclear) a crush on Mulder and hits on him quite a bit. Mulder doesn't notice...but Scully does.
Although Mulder does have a raging porn addiction.
Scully occasionally attempts to have relationships with other men, but her interactions with them are always forced. After her one date in the first season, the only other date we see her go on in the series, she's drugged. She is, essentially, Mulder-sexual from the time she meets him on.
Nikola Tesla in Sanctuary seems to have only ever loved Helen despite his advanced age. There are other attractive women on the show, but he pretty much sticks to complimenting (and harassing) Helen.
Similar to the Good Will Hunting example above, the second season of Game Of Thrones, has a merchant try to convince Daenerys to marry him only for her to make it clear that she still considers herself married to the very dead Khal Drogo.
Community - Dean Pelton is clearly fixated on Jeff.
Incredibly widely used in popular music through the years. For example:
The Platters, "Only You"
Only you and you alone can thrill me like you do and fill my heart with love for only you
"I only have eyes for you", composed in 1934 by Harry Warren and lyricist Al Dubin, and performed by artists as diverse as Frank Sinatra, Al Jolson, Billie Holliday, Rod Stewart, and The Flamingos.
My love must be a kind of blind love I can't see anyone but you... You are here, so am I Maybe millions of people go by But they all disappear from view And I only have eyes for you
"He Stopped Loving Her Today", written by Bobby Braddock and Curly Putman, and released in 1980 by George Jones:
He said I'll love you 'til I die She told him you'll forget in time... Kept some letters by his bed Dated 1962 He had underlined in red Every single "I love you" He stopped loving her today They placed a wreath upon his door And soon they'll carry him away He stopped loving her today.
"There Will Never Be Another You", written by Harry Warren and Mack Gordon
And in our moment of parting, This is all I want you to know... There will be other lips that I may kiss, But they won't thrill me, Like yours used to do
Even 90s indie pop got in on the game, as in "Anyone Else Isn't You" by The Field Mice, written by singer Bobby Wratten:
Other than you, I want no one If I can't have you, I want to be alone Anyone else isn't you And if they're not you, I don't want to know...
Arguably Toshi of X Japan, if the lyrics of "Crystal Piano no Kimi," his overwrought love poem for his lifelong (aside for 10 years) best friend and band co-founder Yoshiki are any indication.
Nina Simone's "My Baby Just Cares For Me";
Liz Turner is not his style, And even Liberace's smile Is something he can't see. I wonder what's wrong with baby? My baby just cares... for me.
The Phantom: You alone can make my song take flight, and help me make the Music of the Night.
Les Misérables has Marius and Cosette be this for each other. This gets rather silly on the side of Marius, because he totally misses Eponine's incredibly obvious crush on him. Eponine, for her part, seems quite Marius-sexual, and thus helps him hook up with Cosette so he will be happy.
Nu-13 from Blazblue is this trope Up to Eleven: not only is she attracted to no one but Ragna, but she likes nothing else.
TsubakiYayoi, as well. Just as much as Nu-13, because she is prepared to take down anyone who tries to take Jin away from her.
Endrance/Elk from .hack//G.U. is "Haseo-sexual". Or "Mia-sexual" considering the first 5 games.
According to the creator, Revolver Ocelot is this way about Big Boss in Metal Gear Solid 3. Which certainly seems to explain some of his more disturbing behavior towards Solid Snake, a clone of Big Boss and a dead ringer for a young version of him.
His Snakesexuality is, in fact, so potent it overpowers brainwashing. At the climax of the fourth game, choosing not to fight a grapple causes Ocelot to give (old, radiation-burned) Snake a tender kiss.
Amy Rose of Sonic the Hedgehog is completely in love with Sonic, and no one else but him. In Sonic The Hedgehog 2006, she even claims that, if she had to choose between the world and Sonic, she would easily pick the latter.
From the same game, Marta is very much Emilsexual.
Tales Of The Abyss has Luke fon Fabre who is clearly Tearsexual and Tear who is Lukesexual they're 9 years apart as well.... We also have Natalia who is Aschsexual the real Luke and Asch who is Tsundere but his brain only functions with Natalia being 60% of what he thinks about.
Dist is clearly Jadesexual. Arietta is also Ionsexual however, the Ion she loved, the real one, died of illness and the Ion with Anise is actually a replica. Maybe Anise is also Ionsexual?
Also from the Persona series, there's Aigis from Persona 3. If her romance is pursued, she will fall for the Protagonist despite being a robot and regardless of gender, though she has a little bit of Gayngst at one point if it's the female Protagonist.
Played to an extremely horrifiying extreme with Alma in the second First Encounter Assault Recon game, making her "Becket-sexual". Doesn't matter that Becket hates her and wants to destroy her, she is absolutely intrigued by him because he is a powerful psychic like her, and his rejection of her simply makes her even more interested in him. She makes it quite clear that nobody else matters except Becket.
Squall Leonhart of Final Fantasy VIII is Rinoa-sexual - completely disinterested in human relationships of any kind before he meets her, and obsessively devoted to her to the exclusion of all else once he admits to falling for her. This is mostly because Squall is a very emotionally damaged person, and Rinoa is the only one who is able to break through the mental barriers Squall erected to keep out everyone else.
Elis in Canvas 2 is Hirokisexual. She gets 15 confessions in a single day even when she looks pale and zombie-like, but rejects every single one.
Soren from the 9th and 10th games only has eyes for Ike and could care less about pretty much everyone else. Justified in that Ike saved Soren's life when they were children, and Soren's Dark and Troubled Past overall.
Unusually for a Visual Novel protagonist, Souta in Kira Kira: Curtain Call definitely has this going on for Yui, and won't let you forget it. His Inner Monologue points out any time he interacts with a woman who is not Yui that she is not as attractive to him as Yui. Combined with his Hot Blooded-ness, he's been occasionally driven to spontaneously express his love for her in rather extreme (though not sexual) ways that have caused her friend to impose an informal restraining order on him.
Mizuhara in Kara no Shoujo has a severe fixation on Toko, though she says she's not a lesbian. Interestingly enough, there's a bad end where she convinces herself she is Toko (it's complicated) and decides the feelings of love and attraction she feels for Reiji are Toko's. Toko admits to no such thing and hasn't slept with Reiji despite what Mizuhara thinks, meaning that Mizuhara appears to have fallen for him herself.
Lambdadelta from Umineko No Naku Koro Ni has eyes only for Bernkastel and maybe vice versa. They've lived for a very long time but has never mentioned another lover or romantic interest subside their declaration of love for each other. Lambda makes it very clear that she wants the game to keep on going forever so that Bern will be caged up in it like a bird and forever be hers. Psycho Lesbian much?
Miyako in Maji De Watashi Ni Koi Shinasai, to the point that in all of the endings where she doesn't end up with Yamato, she's still shown to be waiting for him even decades later.
Kareha of SHUFFLE! Essence+ says in her route that she's never been in love before Rin, and likely would never have been if she hadn't met him.
Grace from El Goonish Shive is "Tedd-sexual". It appears to be simply a result of her Uryuom heritage — the Uryuom being a One Gender Race of alien shape-shifters. Since they can change their external shape at will, they form relationships based primarily on concepts and mental connections. Grace, being 1/4th Uryuom (or so), has inherited this disposition. However, in one non-canon story where reality becomes altered so that Tedd is (and always was) female, Grace hooks up with a different character instead (way to go Sarah!). Although this might be explained by the way, like in every alternate universe where the two are of different genders, the female Tedd and Elliot are in a relationship.
It's actually kind of a sliding scale. Fatima is described as "more Asexual than Collin", and by the end of the comic is married, though it's vaguely implied she's not planning on having sex with her husband. (He seems okay with it.)
Alex/Murfs of Khaos Komix didn't see what the big deal about sex was until he met Tom and became intensely attracted to someone else for the first time in his life. He even calls himself "Tom-o-sexual."
A mild subversion: In the Ciem Webcomic Series, after Don Mendoza tries to rape Candi and fails several times, Candi ends up fighting with herself to not let her interest in men affect her actions. Contrasting that is her sisters, who are much looser. That is, until she meets Donte. Afterward, Candi only considers men that remind her in some way of Donte. This leads to her meeting Denny. From that day onward, those two men are the only men she'll even consider having sex with. It doesn't stop her from taunting other men about how, no matter how hot or not they look to her, she'll never let them have any.
Subverted even more strongly in the book. Since Don's rape attempt back in grade school was partially successful, she no longer believes she has any purity left to defend. She won't let most men near her; but she does make exceptions for Denny and Jack. However, her obsession with Donte is still very strong. She makes it clear that Donte is allowed more positions with her than anyone else would be allowed. And she insists most of the time on not using any protection with Donte, whereas she nearly always used protection with Denny and Jack (at least for non-vaginal forms of sex.) She takes pity on Jack for being a Stalker with a Crush, and lets Denny into her life because his gentlemanly treatment of her reminds her of Donte. When given the chance to live and let live and be with Jack or risk near-certain death saving Donte, Candi takes her chances with Donte. Maybe not single target, but her loyalty is very strong.
Awkward has Alex, who is, as a result of years of harsh rejections, a depraved Lestersexual as of the start of the series. Rather than being the result of actual attraction or compatibility, Alex's record of rejection leads him to crave it; Lester being both heterosexual and Alex's housemate, he is perfectly positioned to give Alex the rejection he comes to crave on a regular basis.
On Hey Arnold!, Helga doesn't even notice the presence of any boys except Arnold.
Waylon Smithers of The Simpsons was "Burns-sexual;" it was decided early on to have Smithers be in love with Burns, but there was a lot of debate about whether it was a matter of Single-Target Sexuality or if he was just gay. The latter seems to have won out in recent years, with Smithers having ex-boyfriends and going to a gay resort on vacation. However, some writers, like Al Jean, still stick to the "Burns-sexual" interpretation. Smithers' sham marriage itself (as seen through flashback) is clearly a parody of Cat On A Hot Tin Roof, a Tennessee Williams play/film about a man who neglects his wife and spirals into depression as he begins to realize he's in love with his dead (male) best friend.
In the Futurama episode "The Prisoner of Benda" we learn that Fry and Leela can be physically intimate even if Fry is in the body of a disgusting lobster person, and Leela has the body of an 180 year old man. There's a decent chance they did all that because they were too prideful to admit there are circumstances where one might find their significant other unattractive, which would make the person "shallow" in their kooky relationship.
Also, in the episode War Is The H-Word Leela disguises herself as a young man to enlist in the military, under which guise Zapp finds himself increasingly attracted to 'him':
Zapp Brannigan: That young man fills me with hope. And some other emotions that are weird and...deeply confusing.
And upon discovering her true identity after she's summarily kicked his ass:
Zapp Brannigan: Leela! So it's you I've been attracted to! Oh God, I've never been so happy to be beaten up by a woman.
While Cody from Total Drama Island started off flirting with any girl he could find, he quickly settled into being Gwen-sexual—he doesn't seem even the least bit interested in Sierra when he first meets her, before she even has a chance to horrify him with her Stalker with a Crush antics. Incidentally, she's Cody-sexual. So, since Gwen doesn't like Cody, we have an All Love Is Unrequited situation.
Mary and Susan from Johnny Test have no interest in any other boy than Gil from next door.
This may not count, as the only other boys we really see are their brother and their Abhorrent Admirer.
There was an episode when 'cute' teen scientists are taken from a t.v. show that looks just like Johnny Test, and Mary and Susan date them at the end.
Even though the sisters are identical, except for their hairstyles, Bling-Bling Boy only has eyes for Susan.
Except when he was hypnotized and told to stop being in love with Susan. He instantly made Mary the new object of his desire.
Callie the succubus from Ugly Americans, is in a fairly committed romantic relationship with Mark Lily. But he later finds out she has other, exclusively sexual, relationships.
As noted at its official page, Isabella from Phineas And Ferb is Phineas-sexual and has not shown attraction to any other boy (except the Beak, but he was Phineas (and Ferb) in disguise).
Candace is Jeremy-sexual. She's only ever gone after one other guy and he was essentially the British version of Jeremy.
Ben's partner Rook in Ben 10 Omniverse is explicitly stated in Bro In Space to have eyes only for his Childhood Friend Rayonna, despite being a Chick Magnet on his planet. The episode even has a scene where he coldly rejects another girl's invitation to a festival.
This can exist in real life, through a type of asexuality known as demisexuality. The AVENwiki definition: "Demisexuals are not sexually attracted to anyone of any gender; however, when a demisexual is emotionally connected to someone else, the demisexual experiences sexual attraction and desire, but only towards the specific partner or partners."
HLA Hart. Widely considered one of the greatest Jurists of the 20th Century was gay. At least until he fell desperately in love with his wife Jennifer. It is stated by some of his biographers that Jennifer was the only woman whom he harbored sexual feelings for.
There's a general assumption - and we're not judging here if this is good or bad - that when you marry you must adopt this feeling towards your spouse.