One or more of the participants may engage in autoerotic sexual activity, such as masturbation, possibly without physical contact with the other participants. Others involve partners who naturally have a significant difference in size. Common phrases used to refer to these individuals are chicks with dicks, trannies, or shemales, although these are generally considered pejorative slurs among transwomen. Technically this is a form of exhibitionism rather than group sex per se. Spanking or whipping pornography involves spanking or whipping, generally of the buttocks, with the hand or with other objects such as belts, switches, paddles, brushes, or whips. The term discipline describes psychological restraining, gay movies with the use of rules and punishment to control overt behavior. The term hentai is never used in this context in Japanese. A common way that these are depicted in a single scene is with one woman and two men performing together. Participants usually derive pleasure from this, even though many of the practices—such as inflicting pain or humiliation or being restrained—would be unpleasant under other circumstances. Bukkake, Gokkun, Omorashi, and tentacle erotica are few momsex uniquely Japanese genres known to western viewers. Pornographic films are generally classified into sub-genres which describe the sexual fantasy which the film and actors attempt to create. Partners can engage in penetrative lesbian hentai sex, known as full swap, or choose to soft swap in which they engage only in non-penetrative sex. A large part of the popularity of these videos is seeing how regular and normal the girls are in real-life. Freud, however, considered such extensions of sexual interest to fall within the range of the normal, unless marked out by exclusivity . Mutual masturbation is a sexual act where two or more people stimulate themselves or one another sexually, usually with the hands. A facial is a form of non-penetrative sex, though it is generally performed after some other means of sexual stimulation, such as vaginal sex, anal sex, oral sex or masturbation.
