Mutual masturbation is a sexual act where two or more people stimulate themselves or one another sexually, usually with the hands. It may be used as foreplay, or as an alternative to sexual penetration. The inside of a smotherbox is often padded to provide support for their neck and prevent their head from moving. Transsexual pornography hentai porn features milf xxx transwomen performers, who typically have male genitalia and augmented female breasts . The current record is held by Lisa Sparks who had sex with 919 men on October 16, 2004 in Warsaw, Poland as part of the Third Annual World Gangbang Championship and Eroticon 2004. 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 . Each participant may engage in any type of sex acts with one or both of the others, such as vaginal, anal or oral sex or mutual masturbation. A female dominant in a master/slave relationship is often termed a Mistress, not to be confused with the colloquial usage of mistress as a kept sexual partner without a similarly formalized power relationship. Bisexual pornography is a genre of pornography which most typically depicts videos porno gay one woman and two men who all perform sex acts on each other. In human sexuality, a threesome is sexual activity that involves three people at the same time. The buttocks in human females thus contain more adipose tissue than in males, especially after puberty. BDSM is a variety of erotic practices involving dominance and submission, role-playing, restraint, and other interpersonal dynamics. The person receiving anilingus is regarded as the passive partner in the act, and the person performing anilingus is the active partner. Individuals are also sometimes abbreviated when referred to in writing, so a dominant person may be referred to as a Dom for a man, and a Domme for a woman.