The genres of pornography are based on the type of activity featured and the category of participants, for example mateur pornography is a category of pornography that features models, actors or non-professionals performing without pay, or actors for whom this material is their only paid modeling work. For legal reasons, the vast majority of so-called reality porn involves professional actors and actresses posing as so-called amateurs. Snuff pornography involves the actual death of any of the participants, consenting or otherwise, simulated death is not considered snuff. However, the tradition of bondage magazines continues in the form of art books of bondage photographs, published by mainstream publishers such as Taschen. Gay-for-pay describes male or female actors, pornographic stars, or sex workers who self-identify as heterosexual but who are paid to act or perform as homosexual professionally. Omorashi: The act of holding one own urine until the need to urinate is urgent, making another hold in their urine, or watching another person with an urgent need to urinate. 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 milf fuck animals . The scenario is a genre of erotica, which on the internet is sometimes abbreviated to CMNF, and may involve sexual and nonsexual erotic scenarios. Can also include auto-fellatio, or performing oral sex on oneself. Reality Reality pornography refers to real or faked amateur encounters. Boot fetishism is a sexual fetish dedicated to boots. Hugo Ohira, director of marketing for Silvercash, rhetorically gay hentai asks Who does not like spewing their load on a pretty young face? Going back at least as far as the Christy twins in the 1970s, depictions gaysex of incest and particularly incest between twins has been a feature of gay pornography. A variation on this is to place the fingers and thumb on the penis as if playing a flute, and then shuttle them back and forth.