Bukkake, Gokkun, Omorashi, and tentacle erotica are few uniquely Japanese genres known to western viewers. Bareback sex is physical sexual activity, especially sexual penetration, without the use of a condom. A crush fetish is a fetish in which one is sexually aroused usually when someone crushes objects, food, and sometimes small animals with their body, usually under their foot, or when crushed oneself. As of 2013, little analysis of this paraphilia has been reported in medical literature. Group sex is sexual behavior involving more than two participants. Strictly speaking, bondage means binding the partner by tying their appendages together; for example, by the use of handcuffs or by lashing their arms to an object. BDSM actions can often take place during mature milfs a specific period of time agreed to by both parties, referred to as play, a scene or a session. A variant of A2M is ATOM where a performer inserts his penis directly from one recipient anus into a second recipient mouth. The smotherbox is placed on a stable surface. Sometimes special furniture is used, such as a queening stool or smotherbox. Rough sex pornography is similar to pornography featuring sadomasochism, and typically features a Top who humiliates and/or degrades a Bottom while being physically violent towards them. The buttocks in human females hentai sex thus contain more adipose tissue than in males, especially after puberty. Transsexual pornography features transwomen performers, who typically have male genitalia and augmented female breasts . The original definition of dogging – and which is still a closely related activity – is spying on couples having sex in a car or other public place. Snuff pornography involves the actual death of any of the participants, consenting or otherwise, simulated death is not considered hot gay sex snuff. The term lesbian is also used with regard to sexual identity or sexual behavior, regardless of sexual orientation, or as an adjective to characterize or associate nouns with female homosexuality or same-sex attraction.