(British: Nappy fetish)
Diaper fetishism, or diaperism, is a paraphilia in which a person feels a strong desire to wear or use diapers, usually without physiological necessity. It is differentiated from infantilism in that those of the latter category are also focused with returning to babyhood in ways other than by wearing diapers. The popular term for diaper fetishists is "diaper lover." Diaper fetishism is a type of sexual fetishism, which is one of many paraphilias.
A wet and messy fetish (WAM) (AKA sploshing) is a form of sexual fetishism whereby a person becomes aroused when substances are deliberately and generously applied to the naked skin, or to the clothes people are wearing. 
Messy substances can include whipped cream, mud, shaving foam, custard, pudding, chocolate sauce, Japanese-style lotion, paint, oil or gunge/slime, etc. Wet substances are mainly water but can also include other liquids such as fruit juice or milk.
Wet Set Magazine is an Australia based omorashi publication. In addition to material on panty wetting culture for "accident prone adults," it also contains diaper lover and urolagnia related material.
Webteases are a relatively new form of pornography that combines erotic storytelling with erotic imagery and sometimes other multimedia content like audio or flash. The viewer is always engaged in a form of sexual roleplaying, supported by the storyline.
Upskirt is a slang term usually referring to up skirt photography, images of the view up a woman's skirt (as seen from underneath), including shots of a woman's underwear, or exposing her vulva or buttocks. Alternatively, an "upskirt" may be a video, an illustration, or simply a view.
Upskirt photographs are common on pornographic websites.
Transformation fetish is a context of sexual fetishism in which a person becomes sexually aroused by descriptions or depictions of transformations, usually the transformations of people into other beings or objects.
A tranny chaser is an individual who is sexually attracted to transgendered people. Originally (and still predominantly) used to describe the men interested in pre-operative transwomen, the term tranny chaser is now being used in FTM communities as well.
Teabagging is a slang term for the act of a man placing his testicles, specifically the scrotum, in the mouth or face of another person, often in a repeated in-and-out motion as in irrumatio. The practice vaguely resembles dipping a tea bag into a cup of tea.
Teabagging is also an erotic activity used within the context of BDSM and male dominance, with a dominant man teabagging his submissive partner, either a woman or a man, as one variation of facesitting and/or as a means of inflicting erotic humiliation.
Tamakeri (玉蹴り)(lit. ball kicking, AKA ball-busting) is a sexual fetish and subgenre of pornography in Japan. In tamakeri pornography, a female kicks a man in the testicles. Some tamakeri fetishists report that they prefer to witness kicks that resound with a hearty slap. Pornographic tamakeri videos cater to masochistic men for whom the idea of getting their testicles kicked is sexually stimulating, at least in fantasy.
Erika Nagai is among the few AV performers who work in this kind of fetish.
Superhero erotica is a genre of pornography or a sexual role-playing fetish, each incorporating elements from superhero adventure stories.
Erotic superhero stories are often comedies, usually a parody poking fun at the superhero genre or at specific popular superheroes. Many feature sexually graphic content, but others avoid the kind of explicit content that would restrict availability to adults.