Everything under fetishes (except for Bishounen and Juujin) are strictly only meant for hentai (18 Restricted) and ecchi anime. In case of ecchi, it must be the main element of the show and not when there's only some of it, for example, there's some ecchi in Shinseiki Evangelion, but just because you get to see Asuka's pantsu doesn't warrant it to get the schoolgirl fetish category added. So be careful to which ecchi show you add fetishes, it's fairly straightforward with hentai, though. Overall, this category tree is to satisfy the needs of people with different fetishes, so they can search for what tingles their tangle; hence why this is restricted to hentai and full ecchi shows.
This category isn't restricted to ecchi and hentai shows. In most cases, bishounen goes together with shounen ai and is mainly targeted at girls. Bishounen anime's cast consist primarily of good looking males with different personalities, think of it as the opposite to a harem anime, just with guys instead of girls and scratch down the ecchi elements. Bishounen anime usually have more serious themes and can have quite a lot of action in them. It should be pretty clear as to what certifies as a bishounen anime, so don't go adding it to every anime that has a handsome youth or two in them.
The term breast can refer to the upper ventral region of an animal's torso, particularly that of mammals, including human beings. Furthermore, the breasts are parts of a mammal's body which contain the organs that secrete milk used to feed infants.
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Pretty much exclusive to hentai shows only unless an ecchi show has implied sex and/or a strong indicator of nudity. A character is considered a student if she goes to school, doesn't matter if it's high school, college or homeschooling, but she should be of appropriate age for a student; a housewife going to college should not get this category.
Almost completely exclusive to hentai animations. Any kind of female teacher will do, even if she only does home visits. Female teachers imply mature women (even if they sometimes look like schoolgirls) dressed in what women would typically wear when doing official business (like a blouse, pinstripe dress with side front slit), but of course, not limited to that. Furthermore, school nurses also count as female teachers unless they're actually wearing a nurse outfit, which they almost never are.
Exclusive to hentai only. Futanari (a compound word meaning "two form" in Japanese) depicts hermaphrodites, intersex or other individuals with female body-types and sexual organs resembling penises, whether or not those organs are in fact enlarged clitorises, or they possess both male and female reproductive organs. Technically, the term also encompasses male characters with both sets of sexual organs, but these are usually excluded. To those who're not that good with technical terms, futanari = chicks with dicks.
Almost completely exclusive to hentai animations. A housewife is a mature woman (should be out of high school age) who doesn't necessarily have to be married in our context, but typically is. A housewife doesn't work (depending on context, she would be an Office Lady instead), however, since we're not as much down to technical details as we are of visuals, that restriction can be discarded if the character in question is shown mostly in home environment wearing leisure time clothing or a kimono and an apron can also be safely added to the bunch.
This category isn't restricted to ecchi and hentai shows. What we mean by juujin, are characters that are otherwise human, but have some animal characteristics, like animal ears and/or a tail. The most well known type is a cat girl, but there are also cat boys, dog girls/boys, fox girls/boys etc. This category should not be confused with furry fandom or with anthropomorphic character types in general, as those are animals with human characteristics.
This category isn't restricted to ecchi and hentai shows. A catgirl is a female with cat ears, a cat tail, or other feline characteristics on an otherwise human-shaped body. Catgirls may also wear over-sized mittens and shoes that look like paws. Sometimes characters do not actually feature cat-like ears or such an accessory but their hair sticks out and resembles cat ears; such characters do not fit the definition of catgirls. A female wearing cat ears or tail accessories also satisfies the condition of being a catgirl.
In Japan, the term describes an attraction to young girls, or an individual attracted to such a person. Outside Japan, the term is less common and most often refers to a genre of manga and anime wherein childlike female characters are depicted in an erotic manner. We use the latter term, while not restricting it for porn only, but be very careful to where you add this category! For ecchi shows, it needs to be clear that any loli characters depicted are there to satisfy the lolicon fetish.
For hentai shows, it needs to be clear that the supposedly loli characters actually are young enough to be considered loli (hard to stamp down the age limit, but younger than 14 can definitely be considered loli), however, since that's impossible to determine, it comes down to personal judgement, which in turn can lead to debates. For vigilant lolicon enthusiasts anything taller than their waistline is too old to be considered a loli, for those less corrupted, an 18 year old high school student can look loli enough, although that can be blamed on the tendency of animators to display the characters younger than they ought to be. That's also the reason why for example Little Monica Monogatari has a weight of *+ for Fetishes::Lolicon, for some, it could have a weight of ***, for others, it could be + or none at all. Take also note, that breast size has no connection whether a character is loli or not; as proven in Eiken even elementary schoolers can have huge tumours in tits they should not yet have.
For hentai shows, it's enough if a maid costume is worn without the female character actually working as a maid. For ecchi shows, the maid profession must play a big enough part in the overall setting.
Almost completely exclusive to hentai animations. A nun is a woman who has taken special vows committing her to a religious life, identified by wearing an ankle-length robe and an apostolnik (or epimandylion) - a cloth veil which completely covers the head (except for the face), neck, and shoulders. Of course, you can't expect the animators to always follow the strict characteristics of a nun, so anything that comes close enough to the attributes of a nun is good enough.
Almost completely exclusive to hentai animations. For hentai shows, it's enough if a nurse costume is worn without the female character actually working as a nurse. For ecchi shows, the nurse profession must play a big enough part in the overall setting.
Almost completely exclusive to hentai animations. An office lady, often abbreviated OL, is a female office worker in Japan who performs generally pink collar tasks such as serving tea and secretarial or clerical work. Office ladies are expected to be dressed professionally, generally in women's suits. Typically office ladies are depicted in a work environment but not always so.
Almost completely exclusive to hentai animations. In general sense, it's the same as lolicon, just replace young girls with young boys. Note that by default shotacon means straight shota, for gay shota you'd need to add yaoi as well. Another thing to note, is the fetish part here isn't really the young boy (although for some it probably is), but the fact that a young boy is among girls (or women) older than him. However, this category should definitely not be added to every hentai show where the girl is older than the guy.
Not exactly a fetish by itself (although for some it probably is), but tentacle sex/rape is a style enjoyed/not enjoyed by many. Tentacle rape is a concept found in some horror hentai titles, where various tentacled creatures (usually fictional monsters) rape or otherwise penetrate women (or, less commonly, men).
Perhaps the first instance of tentacle porn is a woodcut of the ukiyo-e genre made around 1820 by the Japanese artist Katsushika Hokusai called The Dream of the Fisherman's Wife. Tentacle rape genre was made popular by Toshio Maeda (前田俊夫) in the late 80s with his hentai manga titles such as La Blue Girl and Urotsukidoji, both of which were later animated.
Same as tentacles, but instead of being fleshy-slimy, they're made of metal or perhaps plastic, doesn't really matter, as long as they look mechanical.
In general, a trap is a slang term for a transsexual or transvestite, can also be applied to a non-transvestite male who nevertheless passes as a girl. The latter part is what we define a trap to be in an anime. A trap is basically a male who looks (and often acts) exactly like a girl. Note that women who look (and often act) exactly like guys are not traps, but reverse-traps and should not get this category added for anime that contain them.
Exclusive to hentai only. Obviously only applies to females. A virgin is someone who yet hasn't had any sex (has not been penetrated, to be exact), but that's not enough for this category to be added. Add this category if a female loses her virginity and you'll know this either because she admits of being a virgin or admits of losing her virginity and/or there's blood coming out of her vagina.
As it's hard to give a good definition to what exactly is a waitress costume, the profession comes into play - waitresses are those who work at a restaurant/bar/cafe attending customers — supplying them with food and drink as requested. For ecchi shows, the waitress profession must play a big enough part in the overall setting.