It is used, for example, at fertility clinics to stimulate sperm donors. For example, in Australia it is rated Refused Classification . The term combines elements of the Freudian psychoanalytic fetish and the Marxist commodity fetish, and is used in the context of British, Spanish and French colonialism and imperialism and their aftereffects. Group sex most commonly takes place in a private sex party or semi-public swinger gathering, but may also take place at massage parlors or brothels or, in some jurisdictions, at purpose-built locations such as sex clubs. Hardcore pornography is pornography that depicts penetration or extreme fetish acts, or both. Content featuring male bisexuality has been a growing trend since the advent of internet pornography. Spanking can be administered in a number of spanking positions. Clothes wetting: The person is sexually aroused by wetting one clothing or mature milfs observing another person doing so. Starting with erotic stories and woodblock prints from before the 20th century, Japanese pornography evolved into distinct subcategories with the media that in addition of pornographic videos and magazines featuring live actors, there is exist categories of pornographic manga , pornographic computer games , and pornographic anime . Women that take on the roles of the giantess within this fetish often find the practice to be empowering and enjoy being gay movies worshiped. When the interest in a particular subject is obsessive, the behavior may be described as stalking. Double Stuffed , Double Vaginal , or Double Anal pornography involves the penetration of one orifice by two penises or other objects. Adult animation is genre of animation geared towards adults and sometimes teens. Threesome can also refer to a love triangle, a three-way romantic lesbian hentai relationship. Pornography in Japan is large and intertwined business of adult entertainment with unique characteristics that readily distinguish it from western pornography. Many fantasies include the macrophile shrinking before a normal sized woman or keeping his or her normal height while the partner grows in size.