Biological anthropologist Helen B. Sigmund Freud considered foot binding as a form of fetishism. 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. For example, in Australia it is rated Refused Classification . Bukkake pornography involves a performer, usually female, onto whom several men or women ejaculate, usually on the face. Today, pornographic gay bear porn films can be sold or rented on DVD, shown through Internet and special channels and pay-per-view on cable and satellite, and in adult theaters. The volume of semen that is ejaculated depends on several factors, including the male health, anime hentai age, degree of sexual excitement, and the time since his last ejaculation. For much of the history of cinema and television, lesbianism was considered taboo, though since the 1960s it has increasingly become a genre in its own right. Women oriented pornography is sometimes referred to as sex positive pornography. A pornographic work is characterized as hardcore if it has any hardcore content, no matter how horny milfs small. Foot fetishism has been defined as a pronounced sexual interest in the feet or footwear. Likewise, Fox Broadcasting Company has also dedicated an entire evening programming block to adult animation programs, known as Animation Domination. Preggo pornography features pregnant performers and may include erotic lactation as a fetish. Snowballing or snowdropping is the human sexual practice in which one person takes someone else semen into his or her mouth and then passes it to the mouth of the other, usually through kissing. This makes varying degrees of stimulation an integral part of oral sex for many men. Some men also enjoy anal stimulation, with fingers or otherwise, without any prostate stimulation. The industry generally refers to such films as adult films, which is part of adult entertainment. In humans, females generally have more round and voluptuous buttocks, caused by estrogen that encourages the body to store fat in the buttocks, hips, and thighs.