It may involve sexual attraction to women who are pregnant or appear pregnant, attraction to lactation, or attraction to particular stages of pregnancy such as impregnation or childbirth. As with most forms of sexual activity, anal sex participants risk contracting sexually transmitted infections . Incest pornography can feature actual relatives, but the main type of this pornography simply uses actors of similar hentai videos looks naked celebrities to suggest family relationship. The 1979 milf fuck U. Now Hardcore Porn facial gaysex cumshots are regularly portrayed in pornographic films, videos, magazines and internet web sites. Simultaneous penetration of the mouth and either the vagina or anus. A sub-set of vaginal fisting attempts to photograph the female cervix celebrity sex videos immediately after the fist is removed from the now-gaping vagina. Participants usually derive pleasure from this, even though many of the practices—such as inflicting pain or humiliation or being restrained—would be unpleasant under other circumstances. Emetophilia pornography involving vomiting and gagging. A celebrity may allow such a recording to surface willingly, as part of a publicity stunt. 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 . Enema pornography involves adults given enemas to others, often fake. Since development and pronunciation of the buttocks begins at menarche and declines with age, full buttocks are also a symbol of youth. BDSM actions can often take place during a specific period of time agreed to by both parties, referred to as play, a scene or a session. This category also includes pornographic home movies. Mammary intercourse is said by Alex Comfort to produce mutual orgasm in women with sensitive breasts , and it was one of the nine substitute exercises for penetrative sexual activities, as detailed in the Paradis Charnels of 1903.