Perhaps following the example set by gay pornography, they have become a popular subgenre within heterosexual pornography since the turn of the century, featuring both vaginal and anal ejaculations. Threesome or 3some pornography videos gays features one man and two women . Group sex also occurs in populations of non-human animals such as bonobo apes and chimpanzees. Certain websites have begun providing bondage videos and photographs featuring the kidnapping roleplay, which has been largely the hallmark of detective style bondage celebrity porn magazines. Some anthropologists and sociobiologists believe that breast fetishism derives from the breasts similarity to buttocks, but instead provide sexual attraction from the front of the body. Most bisexual porn is made by small production companies rather than the major studios. It has since become popular enough with couples to be discussed during an episode of Sex and the City. Nevertheless, it is only an attempt at phenomenological differentiation. Creampie, also known as internal cum shot, and, in homosexual contexts, also known as breeding and seeding, is a slang term used in pornography to describe when hentai movies a male ejaculates inside his partner vagina or anus. Works in this genre may be considered celebrity news adult for any number of reasons. The activity is done by itself or as a part of or prelude to other activities which many times involve sex. Shotacon : Similar to Lolicon, this genre involves prepubescent or under-aged nude milfs boys between the ages 6–12. The initialism BDSM includes psychological and physiological facets: Bondage & Discipline Dominance & Submission Sadism & Masochism Types of Play This model for differentiating among these three aspects of BDSM is increasingly used in literature today. In some creampie films, both gay and straight, intercourse and internal ejaculation are followed by performers licking up the semen that has videos gays dripped from their bodies. Swinging can take place in various contexts, ranging from a spontaneous sexual activity at an informal social gathering of friends to a regular social gathering in a sex club or residence.