Pleasure for the giver during anilingus is usually based more on the principle of the act. Cum-shot pornography features a collection of male ejaculation scenes. The 1979 gay twink porn U. 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. There is also some evidence that pornography can be used to hentai videos treat voyeurism. The stimulation may involve hands, fingers, everyday objects, sex toys or combinations of these. Social attitudes towards the discussion and presentation of sexuality has become more tolerant and legal definitions of obscenity have become more limited, leading to an industry for the production and consumption of pornography in the latter half of the 20th century. Though the term anal sex most commonly means penile-anal penetration, sources sometimes use the term anal intercourse to refer exclusively to penile-anal penetration, and anal sex to refer to any form of anal sexual activity, especially between pairings as opposed to anal masturbation. BDSM pornography depicts bondage and discipline, domination and submission, sadism and masochism. These typically are leaked to the public via the Internet, with or without lesbian milfs the celebrity consent. Arguably the most famous example of the genre is the Taboo series. Am Abend , one of the earliest pornographic films that have been collected at the Kinsey Institute for Research in Sex, Gender, and Reproduction, starts with a female masturbation scene. While most tentacle erotica is animated, there are also a few live-action movies. 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 sex, known as full swap, or choose to soft swap in which they engage only in non-penetrative sex. See Gay-for-pay. After the prerequisite level of sexual stimulation has been achieved, and ejaculation becomes imminent, the male will position his penis so that the semen discharged will be deposited onto his partner face.