Production of such films was profitable, and a number of producers specialised in their production. The mouth was the most common area to be ejaculated upon. The term has origins in the Greek language . Being forced to wear diapers as a form of humiliation is sometimes a behavior encountered in sexual masochism. Rimjob pornography gay fuck centers around anilingus. Mammary intercourse has sometimes been considered a perversion. Gay pornography is the representation of sexual activity between males. Such documents have not been recognized as being legally binding, nor are they intended to be. Breeding is sometimes followed by felching, which involves sucking the semen from the partner anus. A heterosexual threesome may involve two men and a woman, or one man and two women - that is, two men having sex with a woman , or two women with a man. The fantasy is typically mature milfs based around one or more larger beings dominating a smaller being. Softcore pornography that does not contain ejaculation sequences is produced both to respond to a demand by some consumers for less-explicit pornographic material, and to comply with government regulations or cable company rules that may disallow depictions of ejaculation. Reality pornography is a genre of pornography where staged scenes, usually shot in cinéma vérité fashion, set up and precede sexual encounters. Group sex also occurs in populations of non-human animals such as bonobo apes and chimpanzees. Key party A key party is a form of swinger party, in which male partners place their car and house keys into a common bowl or bag on arriving. The Girls Gone Wild series is one example. Clothed female, naked male pornography features naked men and clothed women; typically, the women humiliate and abuse the men or perform fellatio and/or handjobs on the men. The term breast fetishism is also used to refer to cultural attention to female lesbian hentai breasts and the sexuality cartoon porn videos they represent, with debate continuing as to whether the modern widespread fascination with breasts among heterosexual males in western societies is a sexual fetish.