The term lesbian is also used with regard to sexual identity or sexual behavior, regardless of sexual orientation, or as an adjective to characterize or associate nouns with female homosexuality or same-sex attraction. The range of its individual characteristics is thereby wide. Jerk off instruction features a performer encouraging gay movies or instructing the viewer to masturbate, often culminating in a countdown at the end of which the viewer is invited to induce orgasm. If ejaculation is onto the other person face it can be called a facial. The object milf fuck or situation of interest is called the fetish; the person who has a fetish for that object/situation is a fetishist. A variation on this is to place the fingers and thumb on the penis as if playing a flute, and then shuttle them back and forth. Several hundred exclusively pegging films were produced, as well as twice as many bisexual and straight films with strap-on scenes. Mammary intercourse is a sex act, performed as foreplay or as non-penetrative sex, that involves the stimulation of the male penis by the female breasts and vice versa. Bobbi S. Diaper pornography involves performers wearing diapers, sometimes with an adult performer acting in the role of a caretaker. A pearl necklace is a slang term referring to a sexual act in which a man ejaculates semen on or near the neck, chest, or breast of another person. People may engage in anilingus for its own sake, before anal fingering or penetration, or as part of foreplay. BDSM actions can often take place during a specific period of time agreed to by both parties, referred to gay hentai as play, a scene or a session. In more vigorous forms of fisting, such as punching or punchfisting, a fully clenched fist may be inserted and withdrawn slowly. Foot fetish pornography features heavy emphasis on the feet of the participants, either in combination with kissing and genital sex or in the context of acts such as trampling or crush fetishism. Though there have been numerous gang bang pornographic films since the 1980s, they usually involved no more than half a dozen to a dozen men.