Shotacon : Similar to Lolicon, this genre involves prepubescent or under-aged boys between the ages 6–12. Use of the agreed safeword is seen by some as an explicit withdrawal hot gay sex of consent. This type of pornography is almost exclusively hentai, as true hermaphroditic humans are not fertile and are not usually found in nature. Crush pornography features objects being crushed by an actress or actor, who generally plays an overtly dominant role. Masturbation is the self-sexual stimulation of the genitals for sexual arousal or other sexual pleasure, usually to the point of orgasm. When used as an alternative to penile-vaginal penetration, the goal may be to preserve virginity or to prevent pregnancy. Diaper fetishism, nappy fetishism or diaperism, is a sexual fetish in which a person feels a desire to wear or use diapers. Coprophilia , also called scatophilia or scat , is the paraphilia involving sexual arousal and pleasure from feces. It is typically animated pornography, as the legal age to be featured in a pornographic film in Japan is 18. The activity is done by itself or as a part of or prelude to other activities which many times involve sex. The term pearl necklace is used by some because the drops of semen deposited by the man resemble a necklace of translucent white pearls. The niche popularity grew significantly in the latter half of the first decade of the 2000s. Pussing: British expression for an activity involving a consenting couple where the male partner watches the woman urinate otherwise undetected in a semi-public place, usually a toilet cubicle at a pub, hotel, restaurant, theatre/cinema, office, club etc. Sadism describes sexual pleasure derived by inflicting pain, degradation, humiliation on another person or causing another person to suffer. Some anthropologists and anime hentai sociobiologists believe that breast fetishism derives from the breasts similarity to buttocks, but instead provide sexual attraction from the front of the body. On the other hand, big tit milf gay cocks the masochist enjoys being hurt, humiliated, or suffering within the consensual scenario.