In fiction, teens are ruled by their hormones. Be it boy or girl or something else, they want to attract attention from the opposite sex (and even both at once!). They will think about this all the time and base their actions around it, with absolutely no moral or religious questioning present.
A teenage girl automatically wants to wear provocative clothes, date sleazy guys, do poorly in school and otherwise give her father a reason to be an Overprotective Dad. If she doesn't do anything like that, she still secretly wants to. There's likely to be a secondary character who averts this by being a tomboy or otherwise ostensibly uninterested in "girly" things, but even most of them secretly drool over guys, because in writer-land there's no such thing as a girl who isn't obsessed with boys (or occasionally other girls). If she's not interested in fashion at the start, she usually gets a makeover (unnecessary or otherwise) and subsequently winds up dating the male lead.
A girl is seldom allowed to be realistically uncomfortable with her changing body, or want to maybe stay a child a little longer. In Real Life, many young teenage girls have trouble adjusting to their changing bodies and the resultant shift in attention they receive, do not look forward to having a period, and/or are simply disinterested in boys (or other girls) until they reach their later adolescence. In fiction, a late bloomer is almost universally used only if she's going to become interested in boys and clothes, with the implication that there's something wrong with any girl who doesn't, or that a girl is 'incomplete' without a boy.
This is an unfortunate side effect of the Most Writers Are Male phenomenon; male writers may simply have little to no understanding about how teenage girls work. Books by female writers, especially those that are aimed at a teenage audience, can be better at averting this than adult media that contain teenage characters.
A teenage boy automatically wants to be buff, date fast girls, slack off in school and otherwise give justification for dads to be overprotective. They fall victim to obsession with the other sex, which is fairly unrealistic when the boy in question is still a preteen. Boys tend to be portrayed as spending much if not all their brain-power on getting/dating/impressing girls, when in Real Life most have hobbies and a life outside of skirt-chasing (especially younger boys, unless they're early bloomers).
A boy is seldom allowed to not be interested in sex. After all, all boys want to become manly men as soon as possible, right? Their other interests, if they have any, are second to girl-chasing because A Man Is Always Eager. This trope comes with the implication that there's something wrong with any boy that is not sexually active or that a boy is 'incomplete' without a girl.
If the writer is male, they may become better-thought-out characters because Most Writers Are Male. Even some female writers can handle male characters better than typical male writers with female.
(Younger) Sister Trope of All Women Are Lustful and All Men Are Perverts. As with adult characters, there's no such thing as Asexuality, and there are almost always No Bisexuals, especially among teen males. Older female teens will (very rarely) be allowed to be bi, but again that's because Most Writers Are Male. Gay and lesbian teens have been gaining increasing visibility and are often Played for Drama. This trope comes from the same sort of mindset as Everybody Has Lots of Sex, since both tropes assume that involvement with the opposite sex is highly important to everyone, but usually not alongside it except in a particularly risqué depiction of the high school setting. Lastly, you can expect none of the moral, religious or familial questioning that most teens go through in real life when confronting the issue of sex, unless the character is supposed to be the school's resident religious fanatic.
Though this is taken to severe extremes in fiction, many adults and even some teenagers (and this varies by community) will agree that this is Truth in Television. Its opposite is No Hugging, No Kissing. See also Bratty Teenage Daughter and Dumbass Teenage Son.
- B Gata H Kei: The story is initially about a single, uncontrollably horny 15-year-old girl's desperate desire to have a hundred Friends with Benefits before she graduates from high school, despite her insecurities about her lack of experience and certain aspects of her physical appearance.
- Iceland from Axis Powers Hetalia. In the 2010 Christmas Bloodbath he gets distracted by Germany's muscles, and in the 2011 one he appears to have an Erotic Dream about Turkey.
- Tajima and his outspokenness about his appetites in Big Windup stands out in a series with mostly serious, focused characters.
- In Onegai! Samia-don, the early-to-mid teens Simon "Sil" Turner showed more than one shade of this. In one episode he asks the Psammead to turn him into a girl so he can chase away a boy who was interested in Anne, and in another he was furious when the Psammead got to give Anne a kiss.
- Referenced in Chapter 109 of Kaguya-sama: Love Is War. While Maki finds the idea of teenagers having sex before marriage incredilous, Ishigami points out the "1 in 3 teens have had sex before" statistic from earlier in the series and surmises that Kashiwagi and Tsubasa are deeply entrenched in this trope.
- My Friend Dahmer deals with Jeffrey Dahmer's teenaged years, during which time he fantasizes about a male jogger in the neighborhood... laying dead on his bed.
- In Sex Criminals, after her first orgasm somehow grants her the power to freeze time, Suzie tries to suppress her urge to masturbate until she can figure out how. This doesn't last.
- The protagonist of Archie Comics, Archie Andrews is like this. He juggles two girlfriends, spends all his money on the rich one whose father loathes him, and puts himself in the way of any new girl who will pay attention to him as well. The comics just happen to put it in G-rated terms.
- Many challengers at the Celadon Gym in Pokémon Reset Bloodlines were this, as they were apparently more focused on the girls of the gym being affectionate to each other than their battles.
- Harry in Child of the Storm, being thirteen going on fourteen is just starting to become this, much to his consternation. Mostly, he finds it an unwanted, inconvenient and very embarrassing distraction, especially since he's surrounded by a lot of gorgeous women. Inevitably, he frequently gets gently teased about it - though intriguingly, he does his best to put platonic relationships first (particularly with Carol) and gets snappish if someone implies otherwise.
- Carol's somewhat cynical disposition and tendency towards mistrust is because of a combination of her having been able to pass for a hot college student at 14 and this trope, which inevitably led to a large number of guys trying to befriend her solely to get in her pants. For the most part, she averts this trope, showing very little interest in romance, boys and shopping, instead favouring sports and aspiring to be a pilot. However, she does express... appreciation for Clint's arms, practically levitates out of bed when Jean-Paul (falsely) claims to have pictures of a shirtless Rhodey (or as she terms then, 'sexy man pictures') and checks out a swimsuit wearing Harry in chapter 1 of Ghosts of the Past.
- Jean-Paul, meanwhile, flirts with most things male and Ron displays most of the classic signs of this, to the point where Hermione inwardly notes his one track mind and Harry resolves never to mention to him the snuggling incident with Carol in chapter 59/60 or he'd never hear the end of it.
- She's All That turns the female lead partly into this, complete with Unnecessary Makeover. It still possesses a good Aesop about staying true to who you are, though, even if it's slightly undermined by the implication that you still need to look like everyone else.
- In The Seeker, what's one of the first things fourteen-year-old Will wants to do with his powers? Get a girl. His brother's girlfriend, no less.
- Youth in Revolt: Nick really wants to get laid. He comments when narrating about his parents and their partners that he's the only one who isn't getting any.
- In The Major and the Minor, "SuSu" gets dumped into a whole Military School full of younger-teenage boys who only get to see girls on special occasions. They spend a lot of time trying to get to first base with her, and even draw up a schedule of who gets to see her and when.
- The three boys in Milk Money have this as their defining characteristic, and spend the first act of the movie (and all their money) trying to find a prostitute so they can see her naked. They're eleven, by the way.
- A Brother's Price has Corelle, who goes to chase the neighbour's boy's pants, even though she should stay home and guard the farm, Lylia, who is looking forward to her wedding night so much that her sisters think she'll happily marry any relatively handsome young man, and Cullen, who is very interested in the dirty pictures his cousin Lylia provides. The Protagonist Jerin wants to stay chaste and pure until he marries, but his hormones make this very difficult.
- By means of obvious subtext, this is Older Than Print: The narrators of Boccaccio's The Decameron are three men and seven women between the ages of fourteen and twenty-seven. An inordinate number of the hundred stories involve sex in some way—including several told by the women. And most scholars agree that at a minimum, all three of the guys are actively trying to get into at least one of the girls' pants—in the case of the wit/possible Author Avatar Dioneo, he's probably trying to get into all of their pants. And some of the girls seem like they might let them. (Yes it's the Middle Ages, but it's also the height of the Plague—the kids are unsupervised and Plague does funny things to traditional morality. Also, late-medieval Florence had... unusual... sexual mores for its day.)
- Played straight in Dean Koontz's Phantoms, where it's specifically said that the fourteen-year-old girl is 'at that stage where most girls were obsessively concerned with boys, boys above all else' and opens the book with her arguing with her older sister about dating. She gains more personality as the story goes on. (In The Movie, she's been sent to live with her sister to get her away from a loser boyfriend.)
- Played extremely straight in Twilight; all Bella does is obsess over Edward and how perfect he is. Most of the other female characters aren't much better. Edward is just as bad (if not worse, given his stalker-ish tendencies), and practically every other male thinks about little besides Bella.
- Are You There God? It's Me, Margaret.. In all fairness, it was written in 1970, when discussing things like periods and puberty outside of health class was still somewhat taboo. Judy Blume was somewhat notorious for tropes like this, which gave a coronary to the Moral Guardians of the day, but back then the intent was to show girls that was all OKAY.
- Lois Lowry's YA book A Summer to Die—Molly, the elder sister, is obsessed with boys and the idea of getting married, to the severe annoyance of her younger sister Meg (who is secretly jealous of Molly's boyfriends and good looks). Molly gets sick and Meg at first resents that all her parents' attention is paid to her sister, until she realizes Molly's illness is something serious (it turns out to be leukemia) and she's going to die. Thoughts of boys and weddings help Molly keep some semblance of an idea that she's still a person, not just a terminal patient.
- In the Discworld "witches" plotline, both Magrat and Verence fall under this trope. As in many of the Discworld books, it's Played for Laughs (and Verence and Magrat are both presumably out of their teens, if not by much.)
- The Dresden Files (of course): Molly Carpenter is a Perky Goth version of this. When she first becomes important to the story, she's dropped out of school, gotten a bunch of tattoos and piercings, started hanging around with the wrong crowd, and dresses like, in the protagonist's words, "Frankenhooker." When asked directly if she's sexually active she admits to being a virgin but states that she has "explored" all the other bases (this is admitted to after she openly propositions Harry). She avoids going home whenever possible because any conversation she has with her mother turns into a shouting match inside of ten seconds, and develops a bit of a crush on Harry mostly because her mother hates him. She also started using Black Magic which leads to trouble. On the plus side, when she ends up as Harry's apprentice, she has to follow his rules moderating the worst of her behavior.
- In The Red Tent, Dinah looks forward to having her first period (and thus becoming a full-fledged member of the Red Tent's inner circle with her mom and aunts), and undergoing the mysterious Ritual of Opening so that she is considered a woman and not a little girl. When that finally does happen, she actually looks forward to getting her period every month and the New Moon rituals in the tent done at that time.
- Carter Finally Gets It is a book about a suspiciously Xander-like boy who's absolutely obsessed with BOOBS, as are all his male friends. This would be mostly acceptable, except that the title character is fourteen.
- In Bryan Miranda's The Journey to Atlantis, this is basically the main character's reason for most of what he does. Although it's not all hinged on it, it's the reason he goes to such lengths to appear to be The Hero.
- For the most part averted in The Hunger Games. Katniss and Peeta spend a whole lot of time making out but it's mostly an act because their lives depend on selling the "Star-Crossed Lovers" story. Peeta never presses his advantages when they are alone and even spends many nights sharing her bed but being perfectly chaste, and Katniss never implies that he appears to want to do more than that. The first two books only have two moments where Katniss lets her hormones take control and in the third book she's got a war to worry about (until the end where she sleeps with Peeta and then declares her love for him).
- The Chronicles of Narnia: after the Pevensie kids return to England, the following books mention how Susan has become obsessed with flirting with boys, clothes and so forth. The professor states she is "rushing to enter the silliest period in one's life, and wishes to stay there for as long as possible".
- Journey to Chaos: Despite Brother Neuro's Celibate Hero status, he is easily flustered by pretty girls. He blames his teenage body for this failure in self-disicpline.
- That '70s Show plays this straight but lampshades it frequently. In one episode, it's shown that the only thing that doesn't turn Eric on is the thought of adults having sex — specially if said adults are his parents. (He's totally traumatised when he walks on them about to do it, and even his Jerk Ass older sister pities him for that.)
- Alien Nation: Emily is rather eager to find out, how it would be to "do it" with a human, until she finds out that her human boyfriend only wants her for sex.
- Given that the murder victim in Twin Peaks is one, it's only natural that the scenes focusing on her high school peers would play out like a high school soap opera about Hormone Addled Teenagers.
- 8 Simple Rules.
- The elder daughter in particular is almost as stereotyped as you can get, and a complete airhead to boot.
- The first of the two daughters to lose their virginity was the studious "good" daughter.
- Pick a Disney Channel show. Any Disney Channel show.
- iCarly follows the "tomboy" aspect to the letter with Sam, but averts the trope as a whole, but does the occasional episode like iDate A Bad Boy or iSaved Your Life, where the trope plays out pretty spot on.
- Unhappily Ever After: Tiffany Malloy is a subversion; while she nearly always dresses skankily, she remains a virgin by choice throughout the series.
- Degrassi: The Next Generation: A teacher in the series mentions this trope by name (in an example of Alternate Character Interpretation) talking about Romeo and Juliet.
- Life of Riley: Both of Jim's children are typical teenagers, particularly Danny. Katy is a shopaholic fashion obsessive who loves campaigning for animal freedom while Danny is a lazy and insensitive sex maniac with no sense of personal hygiene.
- Buffy the Vampire Slayer:
Xander: "What am I going to do? I think about sex all the time. Sex. Help. Four times five is thirty. Five times six is thirty-two... Naked girls. Naked women. Naked Buffy. Oh, stop me!"Buffy: "God, Xander! Is that all you think about?!"
- Cordelia's scenes consists of dancing, boys, and bitching at Buffy.
- Buffy herself averts it, at first only because her responsibilities as The Slayer prevent it, but she finds lovers as the series goes on.
- Also, as per the current page quote, Xander. In another episode, when Buffy reads Xander's mind...
- In Season 3 of Outnumbered, a BBC sitcom about a pretty realistic, rather-dysfunctional family, all Jake's storylines involve his new tendency to stare at women, making him pretty lecherous for a 14-year-old.
- Quintuplets was this way with at least three of the kids. Youngest kid Patton was a tiny ball of lust who rarely thought of anything else (his father at one point says he could "move to Hornytown and fire the mayor"), while the episode "Quint Con" reveals that both vain daughter Paige and non-conformist daughter Penny are as well, once you get them behind closed doors.
- Discussed on The West Wing:
Reverend Van Dyke: Show the average American teenage male a condom and his mind will turn to thoughts of lust.Toby: Show the average American teenage male a lug wrench and his mind'll turn...C.J.: Toby!
- Pushing Daisies: The 14-15 year old son of the dead lighthouse keeper in "Legend of Merle McQuoddy" is genuinely upset, but when Olive offers him a hug he buries his face in her cleavage:
Olive: There-there... *pushes him away*Elliot: *Moves to do the same to Chuck.*Chuck: Not here-here. *also pushes him away*
- Cyndi Lauper's "Girls Just Want to Have Fun". Just what "fun" means in the context of this song.
- In Fire Emblem Awakening, while Inigo is the Handsome Lech of the Second Generation, boy!Morgan and Owain also play the trope straight once in a while. In Morgan's case, if he falls for Kjelle he ends up awkwardly admitting that he has what sounds suspiciously like erotic dreams about her, while Owain's supports with any of his dads features said dad catching him with is all but spelled to be a Raging Stiffie.
- Dangan Ronpa: With its premise of "umpteen high school students stuck in a relatively closed space together", it'd be hard for it to *not* have at least some of hormone addling.
- Ménage ŕ 3:
- Amber (who later moved to co-star in Sticky Dilly Buns) was allegedly quite a shy teenage girl, and flashbacks confirm this. However, after Zii introduced her to good sex, she got rather carried away, and ended up working as a porn star. She is in her 20s and has just turned to straight acting when she first appears in the comic's present, and while she isn't bitterly regretful, she seems somewhat embarrassed by her porn career.
- For her part, Lad-ette Zii just seems to have started as she meant to go on in her teenage years.
- With other characters in the comic, it gets more complicated. Details of Gary's teenage years are somewhat shadowy; he claims to have been teased mercilessly and frustratingly by teenage girls, but he also admits to having been an Internet troll, so he may have been a bit of a hormone-addled creep. DiDi, the first of her age group to get breasts (and spectacular breasts at that), doubtless attracted male interest whether she wanted it or not, but she seems to have welcomed it well enough. And Ruby of Sticky Dilly Buns fairly consciously averted the trope after a really bad experience.
- The various teenagers in Sandra on the Rocks are mostly a fairly mild-mannered (and frequently geeky) bunch, but Alex for one clearly has urges; conversations with Sandra, a fashion model who he semi-secretly idolises, sometimes pause as his brain crashes.
- Scary Go Round and its spinoffs in the Bobbinsverse, especially Bad Machinery, tend to play most with the male version; the adolescent boys in the cast are usually very susceptible to being distracted by any good-looking women or girls they see (though not always terribly successful in pursuing them). An older character says of one of them, "He's 16. His body is 73% hormones." The teenage girls in the cast are usually more rational and cool-headed, although they're not always entirely immune to the effect; along with a fair bit of snarky flirtation from the smarter ones, there's at least one teenage pregnancy reported from off-stage. Still, even when the teenage Sarah Grote becomes increasingly sexually frustrated and ends up dating a somewhat older man, she's quite sane and rational about it.
- Cheerleader in Teen Girl Squad is a parody of this type, with her desperate attempts to get "several boys" often resulting in disaster.
- Survival of the Fittest: many handlers feel the need to make their characters (especially female) Ms Fanservices that Really Get Around, or generally treating teenagers as acting more sexual than they really are. Naturally, this is a Pet-Peeve Trope among many handlers, to the point where a mod posted a thread ranting about this trope and several others (possibly NSFW).