When used as an alternative to penile-vaginal penetration, the goal may be to preserve virginity or to prevent momporn pregnancy. Arcane or occult pornography involves sexualized situations with an occult or magical tone or performers who costume themselves in keeping with the theme, for example, a male performer dressed as a wizard. Today, pornographic films can be sold or rented on DVD, shown through Internet and special channels and pay-per-view on cable and satellite, and in adult theaters. The resulting consent and understanding is occasionally summarized in a written contract, which is an agreement of what can and cannot take place. The fantasy is typically based around one or more larger beings dominating a smaller being. Barebacking usually refers to a conscious and deliberate choice to forgo condoms. Typically features adult, masculine men with varying degrees of muscle, body fat, and body hair, akin to beefcakes, or bears. Breeding is sometimes followed by felching, which involves sucking the gay sex video semen from the partner anus. His most famous model was Bettie Page, who became the first celebrity of bondage film and photography. It is geared towards heterosexual hentai videos men, who most typically define a threesome as such. 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. Mutual masturbation, mutual manual stimulation of the genitals between partners, can be a substitute for sexual penetration. The consensual submission of the submissive is sometimes demonstrated to others by symbols indicating his/her belonging to the dominant, such as wearing a collar, special tattoos, piercings, a very short haircut or a bald head. Group sex also occurs in populations of non-human animals such as bonobo apes and chimpanzees. Most bisexual porn is made by small production companies rather than the major studios. There are various subcultures under this umbrella term and distinct difference between these subcultures.