A pearl necklace is a slang term referring to a sexual act in which a man ejaculates semen on or near the neck, chest, or breast of another person. Pornography may be presented in a variety of media, including books, magazines, postcards, photographs, sculpture, drawing, painting, animation, sound recording, film, video, and video games. Some restrict a policy of panties/nipple tape for females and some allow full nudity with explicit sexual interaction allowed. The buttocks in human females thus contain more adipose tissue than in males, especially after puberty. Advocates of RACK argue that SSC can hamper discussion of risk because no activity is truly safe, and that discussion of even low-risk possibilities is necessary for truly informed consent. Adult animation is genre of animation geared towards adults and sometimes teens. One or more of the participants may engage in autoerotic sexual activity, such as masturbation, possibly without physical contact with the other participants. Bottom and submissive are widely recognized terms for those partner in the relationship or activity who are, respectively, the physically receptive or controlled participants. Reality pornography is professionally made porn which seeks to emulate the style videos gays of amateur pornography. Some do not use the diapers at all, for arousal, or bladder and bowel movements. Performers are usually clean-shaven, thinner and more effeminate than ones in mainstream gay pornography. A variation on this is to place the fingers and thumb on the penis as horny milfs if playing a flute, and then shuttle lesbian hentai them back and forth. The definition clash also appears with the English definition of yuri as any lesbian relationship, as opposed to its sexually explicit definition in Japan. The term soft crush refers to the more common fetish surrounding videos involving inanimate objects or small invertebrates being crushed, while the term hard crush refers to such videos involving larger animals with vertabrae, and arguably more pain-susceptible animals .