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2%% Examples were removed for violating the content policy. DO NOT attempt to add new ones.
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4->''"Thank god for virgin 13-year old females writing gay porn."''
5-->-- '''America''', ''Webcomic/HetaliaAxisPowers'', "Buttsex: The Musical"
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7You would expect the people creating erotica to know how sex works, and yet, they often depict things that wouldn't really be enjoyable, should be done differently or are just plain weird. This is usually done on purpose, to conform to what the audience wants to be true. Some of these are perfectly AcceptableBreaksFromReality, since such works caters to [[{{Fetish}} customers' sexual fantasies rather than reality]] and is intended to provide an [[MaleGaze arousing]] [[FemaleGaze display]] of the participants rather than a strictly accurate depiction of the act.
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9In other words, RealityIsUnrealistic.
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11However, this also shows up in a lot of FanFic because said fiction tends to be written by teenagers who don't know all that much about sex. It can also be an effect of lack of research before writing about [[MostWritersAreMale anatomy that]] [[MostFanficWritersAreGirls the author lacks]]. Better to just use a SexyDiscretionShot and call it a day.
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13Sadly, this trope sometimes pops up in works and speeches not clearly labelled as fiction: In RealLife, sex education [[RussianReversal fails YOU]]. The average high school sex ed course in many countries, especially the United States, is often so hilariously incomplete and inaccurate that it leaves you completely unsurprised that most students walk away knowing very little.
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15Compare with IdealizedSex, where the sex is realistic in action but still more idealized than most sex in the real world. See MissConception, TechnicalVirgin, and ButWeUsedACondom for when characters are mis- or uninformed about sex facts.
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17----
18!!Typical subtropes:
19
20* BiggerIsBetterInBed (when sizes cross the fine line between "Wow!" and "I'm scared!")
21* STDImmunity (well, biologically implausibly safe sex)
22* RightThroughHisPants
23* MisterSeahorse (men getting pregnant)
24
25!!Common versions (no specific examples needed):
26The common versions can be divided into three broad categories: exaggerations of reality, convenience tools, and completely impossible.
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28!!!Convenience
29These remove inconvenient bits of reality. Certain needs that actual sex would require, but would affect the pacing of the sex/story.
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31* Implausible lubrication or complete lack thereof. Saliva and plain water tend to dry too quickly. Oils can degrade latex. Other works use things that are sticky or tacky.
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33!!!Exaggerations
34These are at least theoretically possible, but for them to happen in reality would require nigh-superhuman sexual capabilities and/or stamina. Also covers cases where they are very possible, but the frequency of their occurrence in the wild is exaggerated.
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36* Doing it twice (in five minutes): Men tend to need a cool down period.
37* Excessive amounts of bodily fluid (a woman constantly gushing out at the bottom, not just people sweating): There's a limit to how much fluid the human body can produce before becoming dehydrated, which typically heralds the end of an encounter in real life. Similarly, a man only ejaculates up to 5ml of semen at a time, so unless there are multiple male partners present the woman is not going be drenched in it head to toe.
38* A virgin always bleeds: A very common and very old myth in real life, and thus it's no surprise that it turns up in many works of fiction as well, so prevalent that [[ConsummationCounterfeit faking it]] is a trope in its own right. The reality is that some women's hymens bleed during sex and some don't, sometimes even if it's not the woman's first time, which is all totally normal.
39* "Breaking the hymen": The hymen is ''not'' a piece of organic cling-wrap blocking the uterus. What it ''is'' is a thin, loosely donut-shaped layer of tissue inside the vaginal entrance that helps it retain its shape. Unless it has a visible defect or the partner is being too rough, the hymen should not "break" during intercourse and can even remain intact during childbirth; in the event it ''does'' have a defect blocking the opening, the offending flesh is usually removed through minor surgery while the woman is young. The phrase might've been more valid back when such surgery wasn't the norm, but in this day and age the hymen's state is not a reliable indicator of virginity. A woman can even be born without a hymen entirely.
40* Inversely, a lot of pieces focusing on TheirFirstTime or virginity as a fetish will neglect to mention ''any'' difficulties with the breaking of the hymen or bleeding or pain at all, or the woman in question is having so much fun she just gets over it without even taking a breather. Realistically, pain in such a tender spot can be a real show-stopper.
41* Female orgasm from penetration alone. Note that the clitoris is the female equivalent of a penis head[[note]]the latter of which only develops on fetuses ''in utero'' thanks to a novel Y-chromosome[[/note]], which also requires proper stimulation to reach climax.
42* [[{{Anorgasmia}} The Elusive Orgasm]]: Since the 1990's, it's become a fairly common sex joke in comedies (film, television, whatever the case may be) that a male partner in sex has extreme difficulty giving his female partner an orgasm.
43* All gay sex is anal.
44* Sperm as guided missiles: Typically in fiction, if a couple have unprotected sex, the woman is absolutely ''guaranteed'' to become pregnant. It doesn't work like this in real life, as anyone who knows people ''trying'' for a baby can probably guess. [[LawOfInverseFertility This is only if the pregnancy can be used for drama, though]]. Otherwise, you can and probably will have a million Film/JamesBond-type characters who go around having rampant sex with the GirlOfTheWeek and never have to face a consequence.
45* Nothing smells, tastes bad, or is uncomfortable: Anything that would in RealLife is glossed over. This has at least ''some'' basis in reality, since humans in a state of arousal have a decreased disgust response to facilitate procreation, but erotic fiction tends to go overboard with it.
46* Everyone enjoys the same things: It's as true with sex as it is when it comes to pizza toppings.
47* The woman feeling heat in the belly after being ejaculated into: This experience is different for everyone. Some feel it and like it, some hate it or don't feel it at all. Naturally this variance is ignored in fiction.
48* The vagina stretching to fit a huge penis: if the stretching from the dick alone approaches the realm of BalloonBelly, then it poses an immediate danger to the pelvis, leg joints, and internal organs.
49* The vagina ''not'' visibly stretching to fit a huge penis: Unless the guy's poor manhood is getting painfully crushed, this is simply not physically possible and is equivalent to thinking the dick plunges into a PocketDimension.
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51!!!Plain impossible
52These are not physically or anatomically possible by any stretch. They represent imaginative fetishes at best, or just severe cases of not knowing how human bodies work at the worst.
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54* Weird anatomy: Occasionally seen in hentai, and really common in fanfics written by virgins. This generally involves misplacing body parts or making them connect, stretch, or move in ways impossible in real life. Sometimes done on purpose in ScienceFiction and {{Fantasy}} as ExoticEquipment but otherwise generally a sign of either ArtisticLicense or lack of research.
55* Squirting semen directly into the womb: A staple in hentai. Semen is really ejaculated into the vaginal canal before the sperm cells inside travel through the cervix.
56* Mistaken terminology: Many writers don't actually know what names correspond to which body parts. This can lead to weird anatomy as mentioned above. Most of it is a result of badly done sex education classes which result in writers not knowing the proper terms or assuming that everything down there is the same thing.
57* Bizarre comparisons: A staple of PurpleProse, this most likely is done for either romantic or erotic reasons.
58* Implausible positions: Many of these would dislocate some joints if performed in real life.
59* "Go fuck yourself!": The figure of speech [[ScrewYourself turned literal]].
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