Someone is mostly heterosexual, homosexual, or asexual, with one exception.
A romantic rationalization that removes (or tries to remove) potential squick from a non-standard attraction (Brother-Sister Incest, Mayfly-December Romance, homosexual for an otherwise heterosexual character or vice versa, etc.) often uses this phrase. Since the character (usually) acknowledges the unusualness of the potential pairing, the writer gets to assure the audience they shouldn't have a problem with it either and to minimize the deviation from canon characterization.
Judging by the examples presented here can often be place in three categories:
Type 1: The character in question has a one-off attraction to that person that transcends their sexual preference, based on mutual compatibility or otherwise emotional attraction.
Type 3: The exception gradually becomes the rule for that character (this not being a subversion as such as the trope applies at the beginning of the relationship and is seen as responsible for the gradual reveal of the character's sexuality/gradual transition of their gender preference. Examples of this should go on Closet Key.
This is also often an implicit assumption in Slash Fic that tries to pair characters that are generally portrayed as heterosexual (or homosexual — and/or related). This is especially likely if the characters are already Heterosexual Life-Partners, Buddy Cops, an Odd Couple, or are simply shown attracted to one character without any other attractions to reference. When it's made explicit, it's usually referred by "We're Not Gay We Just Love Each Other" (WNGWJLEO) in ficdom, where it's often criticized for its perceived homophobia (as such it's now an almost thoroughly Discredited Trope in Slash Fic).
Since it often preludes a first kiss or actual sex, it's extremely common with 'pure' characters who the writers are otherwise hesitant to show having an explicit interest in sexuality.
This trope can be diametrically opposed to No Bisexuals, which assumes that a given character can only be either heterosexual or homosexual with no exceptions; or cut down in the middle 50/50 in terms of attraction.
A likely requirement for any non-bisexual person in a relationship with a Gender Bender. Or the main character of a Dating Sim. In the case of a homosexual pairing it can result in a limited form of Last Het Romance if the relationship sticks.
In settings resembling Real Life, this trope is only about heterosexuality and homosexuality. In fantasy and Sci Fi settings, it can also be about variables that don't exist in real life, such as a person only being attracted to elves but making an exception for one very special human.
Something similar to this exists in real life; known as hetero/homoflexible, it refers to when someone is usually attracted to only one gender... with a small group of exceptions. There is at least one psychology paper that claims it is possible for everyone with sufficient level of romantic attraction to a specific person, but it mostly examines the issue as a thought experiment.
Compare Single-Target Sexuality, Even the Guys Want Him, Even the Girls Want Her, Memetic Sex God, Stupid Sexy Flanders.
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Anime & Manga
In the CLAMP manga Legal Drug Rikuo literally said this to Kazuhaya in chapter 14 of the continuation series Drug & Drop.
General example: In the large majority of Boys' Love manga, the characters seem to follow the "We're Not Gay We Just Love Each Other" school of thought, since they're usually represented as being "completely straight" until they discover their 'true love' in the form of another guy.
Zigzagged with Ryo in FAKE, the one you'd expect to fit this trope, as he starts the series insisting that he's straight, as opposed to Dee's open declarations of bisexuality. By the end, though, Ryo thinks of himself as a gay guy even though he has loved at least one girl in the past.
Miyagi in Junjou Romantica is in his thirties, and has apparently been rather straight all his life. That is... until Shinobu shows up. Then he's suddenly gay.
In The Tyrant Falls in Love, Souichi is a complete and utter homophobe. And yet, somehow, Morinaga gets him into bed quite a number of times. At one point, Souichi even says he only does it with Morinaga because it's him.
Kento of Future Lovers, before meeting Akira, had his heart set on starting a family with a housewife. In fact, this is one of the main reasons Akira is initially reluctant to pursue a relationship with Kento because he fears that Kento will eventually leave him for a woman who can actually give him a family, but Kento repeatedly assures him that he'll be happy so long as Akira is with him.
In Under Grand Hotel Norman mentions at one point "I'm not interested in men. Except him (Swordfish), that is..."
Okane Ga Nai: Neither Kanou nor Ayase were attracted to males before hooking up. As of chapter 37, it's made pretty clear that both Ayase and Kanou have the whole "If it's you it's okay" thing going for each other. However, EVERY straight guy in the series feels this way about Ayase.
Love Mode's Shakashita Izumi'a feelings for Takamiya.
Honto Yajuu: When pansexual Aki expresses (very unfounded) concern that his boyfriend will leave him for a high schooler, Tomoharu insists that he has no cause to worry because he doesn't like men. When Aki point out that Tomoharu is dating him, he responds with, "well, that's because you're special." Aki seems happy with this response.
Zetsuai 1989: Before he met Izumi, Kouji was a womanizer, and even after they get together he maintains that he's still heterosexual, just madly in love with Izumi. (In fact, he claims that thinking of other men makes him feel sick.)
Iwaki Kyousuke and Katou Youji of Haru wo Daiteita love each other and no other guys.
This is the origin of the term "GAR", originally a misspelling of "GAY (for X)".
GAR originated on 4chan's board. A poster was describing his feelings towards the Fate/stay night character Archer, and mistyped "gay" as "gar". In fact Archer is the main embodiment of GAR with lots of straight guys on the board proclaiming that they are GAR for Archer. Another character that is hugely popular in this respect and has been for around 30 years now ever since his first appearance is Char Aznable from the Mobile Suit Gundam series.
The term has since been refined to refer to characters who are so incomprehensibly manly (Archer from Fate/stay night, Kamina and Kittanevery male character (except Leeron) from Gurren Lagann, Lockon Stratos from Gundam 00, Big Boss from Metal Gear) that your own manliness is buried, leaving you naught but a whimpering, swooning girl child, begging to be graced with their presence.
And apparently living together in .hack//LINK manga, 10 years later. Tsukasa tells Tokkio that "he" might just go home in the middle of their adventure, so she can be with Subaru. This line was, btw, dropped in the "official" translation.
Said crossdresser is probably an example himself. He's in love with Masako, his childhood buddy who he's liked since then. Turns out his friend was a Bifauxnen, and is another character. Yuki does say he doesn't like men too, so he probably has a Single-Target Sexuality.
This is probably more of a subvertion than anything as Yuki seems to be more of pre-op Mt F transexual than anything, rather than a crossdresser, and is specifically stated to "have the heart of a girl."
Chizuru from the Hen manga has never been in love in her life, using her body mostly to gain favors from men. She also views having sex with girls as icky—until she falls head-over-heels for innocent, cute Yamada, which turns her world upside down on several levels. After a reality check Chizuru decides to pursue her love interest with abandon. Poor Yamada never knows what hits her.
And it's made explicitly clear that Yamada is the only girl who makes her feel that way. Her attempts to imagine sleeping with other girls do nothing but squick her out.
Aru Akise spends the whole second chapter of Mirai Nikki - Paradox denying that's he's gay, despite having a blatant crush on the male protagonist. When finally badgered enough, he admits that "it's love", but still maintains he doesn't swing for boys.
A inversion in Ouran High School Host Club: Haruhi's bisexual father Ryouji/Ranka renounced his heterosexual side after his wife Kotoko's death. To him, It's Not Okay If It's Not Her.
Luca also implies that she has this for Hayate-as-a-girl, she states that she'd already have fallen for him if he were a guy, but believes he's a girl because he's been cross-dressed in every encounter with her yet. Placing her within the harem canonically, and just waiting for the bridget-dropping.
It's very strongly hinted - but just short of explicit - that Leon feels this way about Count D in Petshop Of Horrors. For Count D, Leon would be the only human he could maybe possibly ever feel attracted to. It's... problematic.
In Penguin Revolution, this seems to be more or less Yuzuru Narazaki's approach to his feelings for Yukari, given that at the time of his Love Epiphany he still thinks she's a guy, and doesn't find out otherwise until three manga volumes later.
In Mahou Sensei Negima!, Setsuna, who is rather obviously paired off with Konoka from early on, admits that she finds Negi cute and was also attracted to his teenage form. Said comment is probably the basis for shipping all three together. Apart from the obvious hot factor, of course.
They also act this way towards their lord, Oboro. They even end up sleeping with him at the same time late in the series.
½ Prince: Gui's side story reveals that he feels this way about Prince.
Baka to Test to Shoukanjuu: Akihisa Yoshii apparently thinks that homosexuality is wrong, yet has no problem whatsoever confessing to Hideyoshi (or buying fanservicey pictures of him, or getting a nosebleed from seeing him topless.) Of course, given Hideyoshi's appearance, one could argue that he just keeps mistaking him for a girl.
In Aoi Hana, this may be the reason why Akira decides to try dating Fumi.
In ...Virgin Love, Daigo's pickup line to Kaoru is basically: "I like women, but you're gorgeous. My place or yours?"
Wandering Son has a variation. Nitori can best be described as a lesbian stuck inside a boy's body but a girl named Chiba has had an attraction to her since elementary school. Chiba apparently has Single-Target Sexuality, since though she'd prefer if Nitori was a boy she doesn't mind much if she becomes a girl. Nitori's former girlfriend Anna dated Nitori, under the impression she was a masculine boy who likes crossdressing. They eventually break up after Nitori goes to school in a Sailor Fuku and wig, though Anna obviously still likes her to the point where they get back together quickly.
The series ends with an example of this. Anna and Nitori have been dating again for several years now. Anna says she's fine with being considered a lesbian if she's with Nitori.
Used in a series of one-shots in a Yuri anthology called Mermaid Line, when her boyfriend decides to transition into a girl. Ayumi even says she never thought a girl was cute before.
This is played straight and subverted in Boku no Futatsu no Tsubasa where two people are okay with Mako-chan's hermophrodite status while one other says they're okay with it but when it came down to the sex they couldn't do it.
Possibly some of the guys from Princess Princess, who get all excited (to the point of ridiculousness) about the "princesses"... even knowing that they're really guys dressed up in cute girly outfits.
Kanda from D.Gray-Man. Probably his attitude towards Alma Karma after he learns the truth about him.
Also, Cyril clearly likes the ladies but he is also obsessed with Tyki and even flirts with him a couple of times.
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.
Played straight and subverted in Doushitemo Furetakunai: The main character is actually gay, but captures the attention of several 'straight guys' during the story. One of the 'straight guys' falling for him later gets into spotlight and falls for another gay character, but takes a lot of time for it so it still can be considered this trope.
Guts from Berserk is of the asexual variety. Due to being raped as a child, he Hates Being Touched, but eventually, Casca is able to change his mind as applies to her.
Similare to the above, Hinako from Bitter Virgin, traumatised by years of sexual abuse, she only ever allows Daisuke to get close to her, as he doesn't think of her "as a woman". At least, that's what she thinks.
Kanbaru of Bakemonogatari is a self proclaimed lesbian with a crush on Hitagi. However, she also once told Koyomi that if he didn't already have Hitagi she'd totally date him. She once did Attempted Rape on him as well.
Nana Komatsu of NANA is implied to be this for Nana Osaki. She has a very Les Yay ridden relationship with her but is otherwise straight.
Yuuto Kiba from  is this to and somewhat returned to by Issei, although this is all just implied by the almost harem genre of this and Issei not realizing how much he gets the girls, and 
Elizabeth from the series Nanatsu No Taizai doesn't seem to mind that Meliodas fondles her a lot, possible due to having great respect for him.
Lupin III: The Woman Called Fujiko Mine: Oscar, who's "gay as a springtime", as people has put it, but only for Zenigata. (The problem comes around that he hates Fujiko, the main character, and we never see how he thinks of women in general, just his extrapolation of women from Fujiko)
Subverted in Bokura no Hentai. Osamu "Parou" Tamura has feelings for an upperclassman at his school, but the object of his affection isn't attracted to other boys. Parou begins dressing up as a girl to please him but the boy only uses him for sex, doesn't want to be seen with him, and is generally abusive.
This essentially describes the main characters' relationship in Prunus Girl.
Pretty much the law of the land when it comes to Po-Ju's works both in and out-universe (hence the meme "Po-Ju made me gay,") but Nebula is a special case as a Fat and Skinny duo of bullies initially seem like they're going to shake down and/or beat up Harry Potteresque nerd in hot pants only to make him strip naked, reveal the lubricating butt-plug he's been keistering all day then have sex with him while they lampshade their frustration at liking him the whole time and decide to hang around him more afterwards as to "not appear suspicious."
In Sekirei, Mutsu states that he would have preferred being Winged by a "pretty lady", but readily accepts that the Ashikabi that called him is male. This doesn't stop others from teasing him, and their relationship remains somewhat ambiguous at the moment. Minato and Homura also have shades of this, with both unable to admit their feelings but accepting their bond, never the less.
In Jormungand, this is Valmet's attitude towards her boss, Koko. In fact, Valmet has a huge (mostly one-sided) crush on Koko, although Koko keeps it (mostly) professional (much to Valmet's chagrin).
In Aquarion Evol after Mix is captured she's both brainwashed by the enemy and also Gender Bent into a male (because the enemy planet has an effect that causes all life on it to be male). In the final episodes she's finally saved and get's her memories back, thanks to Andy, who was starting to develop feelings for her that she didn't quite believe prior to this, but it looks like they can't reverse the changes to her body. Andy say's he'll still love her anyway, even if she's going to remain male forever, which convinces her his feelings are geniune. Though it turns out to be unnecessary in the end because they do in fact manage to return her to normal.
Michael from Enigma falls for the titular masked man.
Francine and Katchoo from Strangers in Paradise are probably the only couple on this page where both characters felt that it is "okay if it is you." Katchoo is actually very difficult to classify, since she is very clear that she is not interested in men, but simultaneously asserts that she is not gay. Most of the series establishes that she is, and forever will be, only interested in Francine...except that, when she learns that David is dying and he has loved her for years, she reciprocates and joins him in bed to have a child together and also to wait out his remaining days, even though it is clear that Francine is still the only true target of her affections. Francine is the more obvious and iconic example of the trope. She is in love with Katchoo but struggles with the sexual aspect for most of the series, and she is boy-crazy and states openly in mental monologue that she has never been confused about her sexuality before Katchoo. She never shows attraction to any other female through the entire run of the series, but ultimately comes to the realization that, male or female, Katchoo is the only person for her.
In Buffy Season Eight, Buffy (who has been consistently shown to be heterosexual, having several boyfriends over the course of the series) sleeps with Satsu, a lesbian Slayer. Joss has said this is less about Buffy coming out as gay or bisexual (because she still considers herself straight), but that she's "experimenting" and that it was logical step for her. Indeed, in the comic itself it's treated less as romantic, more as Buffy just wanting to be with someone who loves her. Which makes her either a woobie or a jerkass depending on how you feel about how she treated Satsu afterward.
The 1980's Marvel comic New Mutants has Danielle Moonstar: jealous of attention paid to other girls by boys she likes, exhibitionistic in front of boys, admiring of the male physique and in love with her best girl friend Rahne Sinclair.
For a very brief while, it seemed Trickster was headed this way with Piper in Countdown to Final Crisis, alas Deadshot kills Trickster as he's protecting Piper.
Maggie from Love And Rockets describes herself as this, which in some of the early stories irritated her on-again, off-again lesbian girlfriend Hopey.
Although in one of the later stories, when she plants a Take That Kiss on Vivian, Vivian gets into it for a few seconds before punching her. A grinning Maggie's aside response: "Still got it".
"Primary Gain," an AU Code GeassSlash Fic, has a seemingly straight Suzaku fall for Lelouch (who is gay). Suzaku is very, very confused as to how this could have happened, but his recent girlfriend (Kallen) seems to be a highly amused Yaoi Fangirl about the whole situation. It doesn't help that a lot of other characters assume they are lovers, while Suzaku is weakly insisting, "But I like girls..."
Presumably any slash fic based on two obviously hetero, in universe, characters is built on this trope.
This is how Slash Ficstarted, with Star Trek fans deciding that, as far as the rampantly heterosexual Captain Kirk was concerned, If Its Spock Its Okay.
The Sherlock fanfic The Heart In The Whole is made of this trope - the normally asexual Sherlock Holmes begins a sexual relationship with John Watson, but still freaks out at the idea of anyone else touching him.
Most Ranma ½ fanfiction with the "Ranma gets modelocked as a girl forever" plot use this trope in regards to Ranma and Akane. In reality though, both are strictly straight. Neither like the idea of doing anything even remotely sexual while he's a girl.
Akane: *thinking he's going to kiss her* Wait, Ranma. People are watching, you know! And we're both girls! You can't, you can't!
Ranma: *walks past her* You've got a dirty mind!
It's also implied by his thoughts in the chapter "Stand Up, Ranma!" that one of the reasons why Ranma wants to be back to his old self again is because he wouldn't be able to really be with Akane otherwise.
Ranma: Akane... It will be soon... I will be a man again, soon.
A lot of fic deals with Dean Winchester's obnoxiously obvious hetness by declaring that, like the Spock example above, If It's Cas It's OK. (Castiel doesn't have to worry about it, because being an angel he doesn't technically have gender, even though his vessel is male.)
In most M*A*S*H slash fic (yes, it does exist)if it's Hawkeye it's okay for Trapper/BJ/insert-male-character-here. Hawkeye himself is a subversion as fandom has decided he's Anything That Moves and reads him in the series as Ambiguously Bi.
A funny subversion offered by a third, observing party: The Fullmetal Alchemist fanfiction Skeletons by Maiden Of The Moon (to be found on fanfiction.net) has Elricest in a double serving. Once the classic Ed/Al and then again Edward's well, actually Al's, biologicallygrandsons, Edward and Al(exander). When Alex freaks out on the possibility to have an incest fetish his younger sister Rosalie (yaoi fangirl and somewhat an expy of Winry) prompts to snog him and at his clear disgust gleefully exclaims that apparently it is NOT an incest fetish. He just happens to be in love with a boy that happens to be his brother.
With a good amount of NarutoSlash Fic Naruto will be otherwise straight except when he's around Sasuke as well as Sasuke for Naruto.
In the Kingdom HeartsSlash Fic Kiss and I Will Surrender by Fifi McFu, Sora and Roxas are like this for each other.
The Thor fandom has decided that, for Thor's point of view, If It's Loki It's Okay.
The werewolf Victor in Luminosity intentionally went looking for his imprint to cure” himself of being gay, since male wolves can only imprint on females because the point of imprinting is to reproduce and pass on werewolf genetics. It worked.
In A Growing Affection, this trope is how Hana Inuzuka describes her relationship with Shizune.
Hana:I've always found other women attractive, and not just in an aesthetic way. But I generally prefer men. I like the way they smell, and there is nothing like a long, hard...bicep to hold onto on a cold night. But there was something about Shizune; she and I just clicked."
This happens to Sherlock Holmes and John Watson in multiple permutations of the fandom, be it Doyle's stories, the movie series, or the BBC series. Holmes may be asexual, and Watson may love women, but that doesn't matter when it comes to the two of them.
Such a gag ends the 1944 Looney Tunes short I Got Plenty of Mutton: A wolf, having disguised himself as a sexy sheep in order to distract a ram from guarding his flock, finds himself being pursued (a la Pepe le Pew) for most of the cartoon. Finally, the wolf tears his costume off: "I'm a wolf!" The ram's leering response: "So am I!"
Lammbock: Stefan for Mehmet Scholl, a (former) german soccer player.
In Vicky Cristina Barcelona It's possible to see Christina's romance with Maria Elena as an example of this, since when she's asked if she's bisexual, she doesn't say yes.
In True Romance, the main character has a monologue centered around rationalizing the idea that he would have sex with Elvis Presley if given the opportunity. It's written by Quentin Tarantino, naturally.
Subverted tragically in Y Tu Mamá También: the two lead characters have been enjoying a Heterosexual Life Partnership brimming with Ho Yay, but when it turns physical one night (as part of their sexual initiation by an older woman), their relationship ends up destroyed.
Strongly separated from sex in My Own Private Idaho: Mike and Scott are male prostitutes, both treating sex with men as nothing but a business arrangement — except when it comes to each other. Mike loves Scott to the point of wanting to make love with him, and Scott, who is homophobic about any contact between men that can't be explained away by money or teen rebellion, makes an exception for Mike just the once.
Mannen som elsket Yngve (The Man who Loved Yngve) — the otherwise heterosexual, and fully girlfriend-equipped, Jarle Klepp falls in love with his new male high school classmate Yngve, much to his confusion.
Plan B tells the story of two straight men slowly falling in love with each other. Pablo does initially claim that he was once with a guy, but admits later on that he was lying and tells Bruno after a failed attempt to have sex with him that he's confused about his feelings for him because he doesn't even like guys — although it's quite possible that this was mainly due to his heartbreak over learning that Bruno was just pretending to be interested in him to steal his girlfriend back from him, as he's a lot more receptive after Bruno confesses to him that he genuinely fell in love with him for real.
King Marchand in Victor/Victoria falls in love with the title character while thinking that she's a man. Eventually:
King: I don't care if you are a man. (kisses her)
Victoria: I'm not a man.
King: I still don't care.
Skulduggery Pleasant: Pretty much every character who is attracted to males feels this for China Sorrows. This is because she magically makes people who look at her fall in love with her, regardless of their gender. This eventually wears off of most characters as they interact with her more, but she is still considered to be extremely beautiful.
According to Word of God, Butch of the Black Dagger Brotherhood is 'V-sexual', even though both he and Vishous are in committed relationships with women by the end of their respective books.
Judging by many scenes from Lover Revealed, the feelings are mutual.
That one was made pretty clear even without Word of God, though, especially in their novels, but hinted from the beginning of their relationship.
In Orson Scott Card's Homecoming series, you have Shedemei and Zdorab. When Shedemei becomes (unintentionally) ostracized from the rest of the women in their little refugee group due to her being the only one childless (she and Zdorab aren't what the others would call "a real couple", though they were emotionally as close as any of the rest), Zdorab agrees to try for a child with her, for her sake. They end up with two.
Songmaster, meanwhile, has Josif and Kyaren - Josif self-describes as a gay-leaning bisexual. With a 6% attraction to sheep. Expect to see a lot of things like this in Card's work.
Ceilie and Shug Avery in The Color Purple. Hinted at with one painfully awkward kiss in the movie. Stated outright in the book.
The otherwise lesbian dance instructor and neighbor of Kinky Friedman's Author Insert, Winnie Katz has this kind of relationship in his mystery series in an on/off kind of way.
In J. Courtney Sullivan's Commencement, this is how Bree sees her relationship with girlfriend Lara. It's left up to the reader to decide, of course, whether she's right or whether her parents' disapproval is coloring her acceptance of her sexuality. Most of her friends seem to think it's the latter, but we never see her with another woman in the book, so who knows?
In Maureen Johnson's The Bermudez Triangle, Avery has a HUGE one of these for Mel, as she is straight. She says something about it being just Mel, and that she was only gay for her because Mel needed someone to help her realize that she was les.
Alluded to in "The Talisman" by Peter Straub and Stephen King. Jack Sawyer has the ability to "flip" between Earth and a parallel world, and the more time he spends in the other world, the more attractive he becomes to people in the real world when he returns. To the point that a man that picks him up while hitch-hiking thinks about sexually molesting him without being quite sure why, so he drops him off at a truck stop much earlier than he intended.
In Paul Auster's Sunset Park, Miles Heller's old friend Bing Nathan feels like this with Miles. Unsure about his own sexuality he even tries out sex with another guy, but comes to the conclusion that the male body provides "no comfort" to him. He pushes Miles in the corner of the Memetic Sex God in this citation: "He was not the only one who felt this way. As far back as he can remember, Miles seemed (...) to possess some magnetic, animal force that changed the athmosphere whenever he walked into a room." This is verified by the way the other Sunset Park squatters react to Miles.
This comes out in a painfully awkward conversation between main characters in Pocket in the Sea, in which the main character has to convince his best friend, who has a deep, lifelong crush on him, that it really is a case of "If it's you, it's ok." The otherwise straight main character goes so far as to negate the possibility of a future wife, something he had previously insisted on allowing.
In many versions of from Arthurian Literature, this defines Lancelot's relationship with Guinevere, as he is never at all attracted to anyone else.
In Harry Turtledove's Worldwar series, "Mutt" Daniels is trying to romance a nurse named Lucille, who lets him know in no uncertain terms that she's not interested in men. Mutt understands what she means but can't seem to let it go. Eventually, he asks if she's even been with a man. She replies no, but implies that she may make an exception for Mutt. A minute later she's killed in an artillery barrage.
In Pretty Little Liars Emily is rather shocked when she finds herself falling for Isaac, the frontman of a Christian band, when she has only been attracted to girls before (or since).
Played with in Hometown. Kara is a lesbian, but experiments with her friend Jason. While they care deeply for each other and the liaison goes well, it only confirms to Kara that she's 100% gay.
In Dog Warrior Atticus Steele believes himself to be heterosexual for most of his life, but his love for his male roommate and later partner Hikaru Takahasi is strong enough to overcome that when Ru expresses an interest, and the two are a firm couple.
Giles De'Ath in Love and Death on Long Island says he was completely heterosexual before he fell for Teen Idol Ronnie Bostock in middle age, even though his upbringing in British boys' schools gave him plenty of opportunities to do otherwise. Generally he doesn't seem to subscribe to modern concepts of sexual identity however; it's a much bigger blow to his self-image that he's fallen for a bad artist than for a male one. (The film version leaves this whole issue a lot more ambiguous.)
Live Action TV
Played straight on 30 Rock when Frank falls head over heels for the office's hot, young coffee guy. After much exploration, including an unsatisfying dance at a gay club, Frank realizes he's only "gay for Jamie".
When Jack shows a picture of his girlfriend Elisa (played by Salma Hayek) to the actor who plays the generalissimo, he exclaims "I am super gay and I would totally switch for her".
At one point, Liz herself seemed a bit attracted to Elisa.
Elisa: I have a terrible secret. Please don't ask me what it is.
Liz: I don't want to know what it is! (pause) Are you a man?
Elisa:...Really, Lemon? You want to see me naked?
Liz: Kind of.
Although never explicitly shown, Karen and Jack in Will and Grace seem to have this type of relationship. Although Jack is a gay man (and one who frequently states his disgust at heterosexuality) it is implied that he and Karen frequently engage in sexual activity with one another.
Jack: I don't know, Karen. Karen: I'll let you make out with me in the elevator. Jack: Okay!
Paige and Alex in Degrassi The Next Generation. Paige identifies as straight, with Alex as her one exception, while dating Paige helped Alex realize she was a lesbian.
The latest season of Nip/Tuck features an interesting variation on this trope. Liz Cruz, who up to this point has been a committed lesbian, discovers she's sexually attracted to her male boss Christian (but not any other guys).
Bongo in Red Dwarf episode Dimension Jump: "I've been happily married for 35 years. It's just, a chap like you can turn a guy's head."
In a slight variation on this trope, the episode "Crush" includes this line from Harmony to Spike: "No threesomes unless it's boy, boy, girl. Or Charlize Theron."
After Willow decided she was strictly lesbian, she still had feelings for Oz, so this trope probably applies late in season 4. The chances are that she's actually bisexual, just afraid of causing Tara distress by expressing attraction to men. She also mentions finding Dracula sexy, but quickly takes it back when Tara sounds just slightly concerned. Giles performing "Behind Blue Eyes" can leave her breathless. In season seven she says, "It wasn't girls. It was... girl. One girl." in reference to her relationship with Tara, so this trope might actually have applied to her despite all the declarations of "Gay now!" (Of course, this was a conversation with another woman who she then has a relationship with, albeit a kind of unpopular one.)
According to Torchwood: Children of Earth, Ianto Jones isn't really gay. Jack is just specialnote "It's not men; it's just him. Although, later on Clem can smell the queerness of him, so whether he's being honest to his sister may be left up in the air, especially as it's later established that he lied to his teammates about his family.
The novels have him making out with a man. While he's in a woman's body.
Lily: Robin Scherbatsky is many things: friend; confidant; occasional guest star in some confusing dreams that remind me a woman's sexuality is a moving target...
And, in one episode in which Lily is having second thoughts about getting married, she tells Robin about all the things she wanted to do before marriage but never got the chance - like taking up painting professionally, traveling, or having a lesbian 'experiment'. Robin's answer to this is to plant a girl-on-girl kiss on Lily's lips, which is accepted with a smile.
Lily is, quite frankly, even gayer than Willow. Up to and including trying to get her husband into a threesome with Robin and in the same episode starts tearing off her clothes after kissing her.
Also, in "The Three Day Rule," Marshall and Barney both admit that they're kinda gay for Ted.
And by "admit that" we mean "repeatedly attempt to engage Ted in sexting (posing as a woman he just met) and get into a fight about which of them would be more sexually compatible with Ted before realizing what they're saying."
Michael Scott on The Office has this for Ryan Howard. It seems to start in The Dundies when he gives Ryan the "Hottest in the Office" Award (complete with a pat on the butt), and grows throughout season two. Other notable examples would be when Michael says he'd have sex with Ryan during a game of "Who would you do?" in The Fire, and in the cold open of The Carpet when Michael stares salaciously at Ryan while he's filling in for Pam at reception. In The Deposition, it is revealed that Michael even writes about Ryan in his diary.
Sugar of Sugar Rush only likes men as a general rule and will sleep with most of them without a second thought, but eventually ends up sleeping with her best friend Kim (who is gay, and whose powerful crush on Sugar drives the plot of the first season). It only happens once, and afterwards Kim eventually gets over Sugar. However, there are several hints that Sugar does genuinely fall in love with Kim following this incident, as evidenced by her jealousy over Kim's new girlfriend, Saint, and her behaviour in the series finale.
Emmerdale's Debbie and Jasmine seem to fall into this category. Their friendship twice turned into a romantic relationship and they were practically portrayed as each other's soul mates, yet neither of them ever showed an interest in any other girl and both slept with several male characters.
A Running Gag on Sports Nation is that Colin Cowherd has a crush on New England Patriots quarterback Tom Brady. Occasionally, when Cowherd talks about Brady, a clip of him saying "I love Tom Brady" will pop up on screen.
In an episode of My Hero George's shapely arranged bride comes to Earth. Mrs. Raven declares "I'm straight, and even I fancy her!"
On The Big Bang TheorySheldon finds relationships to be unnecessary and, partly due to his germophobia, revolting. However he's okay being more than boy-slash friend with Amy because she's amazingly compatible with him. And as of season six he has admitted he's become so comfortable with her he may not be opposed to sleeping with her one day.
Xing Bairong of Witch Hunter fits this profile as of a recent character bio page, in which he is described as being interested in "sexy girls with hot bodies" and disliking "guys, with the strange exception of Tasha Godspell".
A non-romantic example in Orange Marmalade when Si-Hoo says he doesn't "bend that way" but says that he'll make an exception for Jae-min just so he'll "have him". Jae-min then tries to punch him in the face.
Of Montreal has a song called "Tim, I Wish You Were Born A Girl".
"Wayne Gretzky" by Goldfinger.
"Dude Looks Like a Lady" by Aerosmith. Sure it's about a Wholesome Crossdresser, but it still fits. The implicitly straight falls for a "girl" at a bar and takes her backstage. There he discovers the truth right before "consummating" the relationship and decides to go through with it anyway because, well, he is pretty damn hot.
"Lola" written by Ray Davies and performed by The Kinks. Almost.
Belle and Sebastian's "Seeing Other People" is all about this trope, although at least one of its two characters is severely self-deluded. "We lay on the bed there/Kissing just for practice..."
The Magnetic Fields' "Andrew in Drag" is narrated by a straight man reminiscing about the time his (also straight) friend Andrew did drag for fun, and realizing that Andrew in drag is in fact the only woman he's ever truly loved; over the course of the song, the title is rhymed with "A pity she does not exist/A shame he's not a fag" and "There is no hope of love for me/From here on I'll go stag". Of course, the irony here is that the song is written and sung by the openly gay Stephin Merritt.
Both the Reign of Winter and the Crusade of the Righteous adventure paths include a lesbian couple where one of the women was originally a transsexual man who underwent a Gender Bender with his lover's support.
Reign of Winter includes a non-sexual, optional variant, in that a player who pretends to be a WinterWolf to get into the city of Howlings and who uses diplomacy on the female winter wolf guard there will have her start flirting with them, as she's looking for a mate. If they respond positively, and aren't a Jerk Ass about revealing the truth after things get serious, she doesn't care that they're really a human and wants to keep the relationship.
Invoked in Lanford Wilson's monologue play A Poster of the Cosmos.
Depending on the production of Cabaret, this can be Cliff's relationship with Sally.
The turian Garrus Vakarian becomes a romance option in Mass Effect 2 for female Shepards. He notes that he doesn't have a "human fetish"; he just really digs Shepard. And is seriously confused about how their relationship works.
The same applies to the quarian Tali'Zorah in the same game. In fact, data files indicate she (and several other characters in that game) were planned to be available for same-sex romance, but cut before release. As a result, her dialogue path with a female Shepard pretty much ends with stammering out the trope, then loops into the same dialogue non-resolution as with a male Shepard that turned her advances down out of fear for her health, which can be interpreted as a blatant case of Hide Your Lesbians.
The One-Gender Race asari seem to provoke this reaction from pretty much everyone. Sha'ira, the asari "Consort" from the first game, appears to be wildly popular with both male and female humans, and there are at least hints that it's not limited to her, and that it's not especially rare for human females with no prior lesbian tendencies to become attracted to an asari. For example, one of the "background" characters you overhear in the third game is a female marine whose male compatriots are a little weirded out by her desire to join them on a "boys' night" watching hot asari dancers.note The character's "human" sexual preferences are left somewhat ambiguous except that she is very sexually aggressive. Another background character is a human female cheating on her husband with an asari.
If you talk to Mordin, the salarian doctor/scientist a lot, sometimes he thinks you are trying to woo him (if you're not romancing anyone else on the ship). He tells Shepard that he's not interested, because the salarian sex drive is generally dormant outside specified mating periods. However, he remarks in the same breath that if he would ever get it on with a human, said human would be Shepard, regardless of gender. Furthermore, asari are apparently capable of awakening a salarian's dormant sex drive.
Mass Effect 3 arguably has one in Male Shepard and Kaidan. Kaidan was not a romance option in the first gamenote Actually, it seems a Male Shepard/Kaidan romance was originally possible in the first game, but cut. Some dialogue from their romance remains in installed files, but was not used in the game itself. Modders have attempted to create a playable version of the romance., and there is really no evidence of Kaidan having any bisexuality. Furthermore, the dialogue between the two in the third game seems to indicate that this is not the norm for either character, and the romance is more this trope.
Let's just say that Shepard is this for pretty much everyone. S/he's basically a human asari, and could probably romance a Reaper with minimal effort if s/he wanted to.
That said, Big Boss's superpower seems to be being the personification of Even the Guys Want Him, if Revolver Ocelot's application of Gaussian Girl every time he lays eyes on BB is of any indication. Kaz probably fell victim to it as well.
Adell from Disgaea 2 makes it known that he's a fan of neither demons nor women (both a result of a past trauma relating to a Succubus). He makes an exception to both cases for Rozalin.
In Saints Row IV, all romance options are available to both genders, even when the love interest in question has shown absolutely zero attraction to that gender before, implying that this trope is in effect. Invoked with Pierce, who says that he "usually doesn't swing that way" before accepting... regardless of the player's gender.
Played relatively straight in don't take it personally babe, it just ain't your story, when friendless loner Nolan reciprocates the advances of camp gay classmate Akira on the grounds that having someone that interested in him romantically makes him warm and fuzzy inside. As they gradually segue into a standard couple, whether this is a case of Type 1 or Type III for Nolan is left an open question.
Kara no Shoujo: Mizuhara admits to herself early on that she's in love with Toko, but doesn't want to mention it because neither of them are lesbians and thus the relationship has no real chance.
At one point in Little Busters!, Riki, who as the protagonist of a Bishoujo Game is definitely into girls, admits to having feelings for Kyousuke but denies it outwardly. When Kyousuke says something that seems to indicate he has feelings for Riki too, he is shocked:
Riki:Mutual love?! What should I do...? Kyousuke likes me too... We're both guys, but it's Kyousuke, so...
Used to the point of ridiculousness in the otherwise excellent Arcana, where two of uke Holden's semes love interests, Sloane and Dominic, both claim to be straight, and his former seme lover, Vincent, is only gay as a side effect of his vampirism.Justified in that Holden was imbued with a portion of Arcana's power as a child, the effects of which caused everyone he met to be attracted to him. Also, Vincent didn't turn gay as a result of his vampirism: he was just mentally taken over by Adonis.
In DARA Super Girly Top Secret Comic Diary this becomes quite central to the story's plot with Erika, an out and proud lesbian, falling in love with a man and having a sexual identity crisis about it. She eventually decides that it doesn't matter and settles for calling herself "queer".
El Goonish Shive has the wanting-to-be asexual Susan crushing hard on Elliot, including a joking version of this trope where she states that "It's okay if you do it" regarding semi-sexual humor.note In this case, asking about why she didn't wear the original Star Trek uniform for women rather than The Next Generation's
There is an interesting subversion in Friendly Hostility. Collin claims many times he's asexual (he genuinely seems to hate people and can be down right misogynistic at times) and he just likes Fox but later he just realizes he's gay.
In Homestuck, Jake seems to be considering this in regards to Dirk.
Defied with Dirk's feelings towards Roxy, he does care about her (platonically), and in fact he says he wishes he could reciprocate her feelings, because he can see how much anguish her unrequited crush is causing her, but it just isn't in him to fall in love with a woman.
Also, a long-running gag on the relationship between Rayne and Noel states that the two, while unabashedly straight, are borderline gay for only each other.
Noel: Kate asked me if you were my soul mate. Rayne: And what'd you tell her? Noel: The truth. That yes, you were. And that I was only with her instead of you because she has girl parts. Rayne: Sometimes I forget if we're gay or not.
Rayne has had other gay encounters, likely meaning he's bisexual.
Played with on occasion in Ménage à 3, though there, (a) characters may be in denial about their bisexual impulses (which are widespread in the comic), and (b) the "You" in question is sometimes DiDi, whose sex appeal verges on the supernatural. After the expert seductress Zii gets the not-very-bright Sonya into bed, the latter spends a lot of time declaring that she's not a lesbian, but also that her heart belongs to Zii. (She barely seems to have heard of the word "bisexual"; when she's reminded of it, she does acknowledge that it might suit herself.) Earlier, the apparently entirely straight Sandra was definitely tempted by the idea of a relationship with DiDi, while later, Peggy, who Experimented in College but who prefers men, very willingly offers DiDi Pity Sex, because with her that's no sacrifice.
Although she might be outright bisexual (and only realizing it now). It's unclear at the moment.
Later on, Missi, who has spent nearly every comic since her introduction pining for Ash, admits that she doesn't even like girls… other than Ash. This is used as the page quote.
Agent 300 from Humon's series Niels has two of these. The first one being the title character Niels (whom he flirts with often and even has erotic dreams about early on). The second one being his current boyfriend, although he denies being a true bisexual considering his love for women, the only meaningful relationship he's been in during the series' run is with agent 250.
This isn't strictly true of course, as Robin's first girl-crush was on Amber.
Hinted at in the relationship between Terinu and Matt.
Xing of Witch Hunter is a total ladies man, he is constantly hitting on them, flirting, chasing and taking his shirt off around them. He hates men, actively avoids them and all around wants nothing to do with them... Except the male lead Tasha Godspell, who he is constantly hitting on and declaring his love for. Even Xing's close servant and bodyguard admits she has no clue what goes through Xing's head about Tasha.
Lucas' feelings for Cadugan in Yet Another Fantasy Gamer Comic seem to fit this trope. It's possible Lucas is bisexual, and is only discovering this now as his long-running Slap-Slap-Kiss with Cadugan finally reached its happy conclusion. But he still seems to be attracted to women otherwise. As he tells his father's ghosthere, "You want to know if I like boys. I don't know. I like that boy. Though I am still interested in women."
Beth and Trixie in Original Life, at the end of the pornfolio comic they agree that they're not lesbians, and Trixie suggests they do it with one of her sort-of-boyfriends next time.
In TwoKinds, Natani is effectively a female-to-male transsexual, having a masculine mentality/self-image of herself due to needing part of her brother's soul patched onto hers. Since her brother is a heterosexual male, in her mind, Natani is the same; even though her body suffers reproductive heats that give her strong urges to mate with males, she finds the idea gross on a conscious level. At the same time, though, she has fallen very strongly for fellow adventurer Keith, who is biologically and mentally male. This is giving her strong conflicting urges towards him.
The Saga of Tuck mostly averts this. Travis is attracted to Valerie, but it's revealed that he thinks she's a transsexual, either post-op or on her way, which would make him straight but unprejudiced (as he knows.
Carmilla may not count, since she's basically a demon of lust, and is changing from 'human het male' to 'hot demon babe with lust aura who is still uncomfortable about dating guys' to whatever she'll be in a few centuries.
Also from the Whateley Universe is Gateway, AKA Molly. Molly, before meeting Chou, never thought of girls in a romantic way and isn't attracted to girls, apart from Chou.
Subversion: Sizzle agreed to help the newly-transformed Jobe work out some of her frustration in exchange for genetically-engineered Boobs of Steel. Unfortunately for poor Darcy, it turns out that sex with Drow is addictive...
Yusketeer members Yusiko and Yukito seem to have this relationship, he has said he would go heterosexual for her.
But he told me I WAS SPECIAL!
The Mad Scientist Wars has two somewhat unique examples of this. One is Xerox, who is now married to Jess 'The Chimera' — a shapeshifter. Regardless of wether she's shifted to a boy or whatever he's cool. The other is Cool Old Guy (s) Dr. Viktor and Dr. Io, who may both be this for each other...
From the Global Guardians PBEM Universe: You should be very clear on this: Fiona Richards is not a lesbian, and has, in fact, dated and even had sex with several different men. Its just that she's madly in love with Margaret Shaw. She doesn't find any other woman attractive at all. And she wants you to be very clear on that.
Although both straight, both Harry and Ron in A Very Potter Musical show overwhelming love for Zefron. Lord Voldemort also misses his *cough* bromance with Quirrel after he gets back together with Bellatrix. Despite trying to get both him and Quirrel laid earlier on in the musical.
It is implied that he was dating John (from Homer's Phobia) at some point.
Ray Gilette from Archer is quite Camp Gay but he's still willing sleep with Lana since, as he puts it, "no one's that gay."
And later Archer is the last one to find out that the otherwise heterosexual Lucas Troy has always been in love with Archer. The show also toys with, but never explicitly confirms, the idea that Archer, while also otherwise heterosexual, may subconsciously reciprocate his feelings too.