Female dominance refers to BDSM relationships and BDSM scenes in which the dominant partner is female. Other objects such as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection. If ejaculation is onto the other person face it can be called a facial. Starting with erotic stories and woodblock prints from before the 20th century, Japanese pornography evolved into distinct subcategories with the media that in addition of pornographic videos and magazines featuring live actors, there is exist categories of pornographic manga , pornographic computer games , and pornographic gaysex anime . Some techniques which may work for one individual can be difficult or uncomfortable for another. Pornography may be presented in a variety of media, including books, magazines, postcards, photographs, sculpture, drawing, painting, animation, sound recording, film, video, and video games. Some may keep their hand stationary while pumping into it with pelvic thrusts in order to simulate the motions of sexual intercourse. Animal masturbation has been observed in many species, both in the wild and in captivity. Bestiality is illegal mature milfs in many countries. Rape pornography features performers simulating hentai porn rape. It concludes these findings suggest that an explanation for fat admiration may be that FAs are rejecting sociocultural norms of attractiveness. A crush fetish is a fetish in which one is sexually aroused usually when someone crushes objects, food, and sometimes small animals with their body, usually under their foot, or when crushed oneself. The term soft crush refers to the more common fetish surrounding videos involving inanimate objects or small invertebrates being crushed, while the term hard crush refers to such videos involving larger animals with vertabrae, and arguably more pain-susceptible animals . Pro-am pornography is sub-genre of amateur pornography that refers to professionally made porn that features amateur actors/actresses, often appearing for the first time in a pornographic film.