When all regions of the face are included, facial cum shots comprise approximately 62% of scenes where external ejaculation occurs. Teacher and Student or Boss and Secretary pornography involves sexualized situations which take place between an authority figure, such as a teacher or boss, and an underling, such as a student or secretary, often fake. One-sided male nudity can also arise when a male disrobes as part of a male striptease. It may also involve touching, rubbing, or pinching the nipples or other erogenous zones while masturbating. The interaction between tops and bottoms—where physical or mental control of the bottom is surrendered to the top—is sometimes known as power exchange, whether in the context of an encounter or a relationship. The hentai videos first film was released in 1980 starring Kay Parker. Seconds after being deposited onto the face, the semen thickens, before videos porno gay liquefying 15–30 minutes later. Fat fetishism also incorporates stuffing and padding, whereas the focus of arousal is on the sensations and properties horny milfs of a real or simulated gain. The shocker accomplishes this using several fingers of one hand. Sometimes, asymmetric and often intentionally uncomfortable positions are employed to heighten the psychological impact of the bondage. POV pornography involves camera angles designed to provide the viewer a view similar to that seen by one of the participants, whose face is never shown. Exhibitionist pornography features performers, usually female exposing themselves in public and spans simple flashing to public sex. Given the wide range of practices, some of which may be engaged in by people who do not consider themselves as practicing BDSM, inclusion in the BDSM community or subculture is usually dependent on self-identification and shared experience. Cum-shot pornography features a collection of male ejaculation scenes. Gang bang pornography is a type of pornography that depicts an individual engaging in physical sexual activity with multiple partners sequentially or at once.