Sadomasochistic scenes sometimes reach a level that appear more extreme or cruel than other forms of BDSM—for example, when a masochist is brought to tears or is severely bruised—and is occasionally unwelcome at BDSM events or parties. Many of these activities might be based on rape. It is a matter videos porno gay of subjective definition whether participation of a third person without physical contact constitutes a threesome. Special forms include erotic roleplay like ageplay, in which a difference in age, momsex either real or enacted, formulates the background; or petplay. Mammary intercourse involves the man placing his erect penis in the woman cleavage and thrusting between her breasts, while the breasts are squeezed around the penile shaft, thus creating a tight cleft for stimulation. Creampie, also known as internal cum shot, and, in homosexual contexts, also known as breeding and seeding, is a slang term used in pornography to describe when a male ejaculates inside his partner vagina or anus. Following World War II, during a period of social repression when governments actively persecuted homosexuals, women developed networks to socialize with and educate each other. The term breast fetishism is also used to refer to cultural anime hentai attention to female breasts and the sexuality they represent, with debate continuing as to whether the modern widespread fascination with breasts among heterosexual males in western societies is a sexual fetish. Group sex also occurs in populations of non-human animals such as bonobo apes and chimpanzees. Anilingus is an oral and anal sex act where one person stimulates the anus of another person by the use of their mouth, including lips, tongue or teeth. Some prefer a particular type of clothing to urinate. No causal relationship is known between masturbation and any form of mental or physical disorder. Standing up, a chair, the corner of an item of furniture, or even a washing machine can be used to stimulate the clitoris through the labia and clothing.