Group sex is sexual behavior involving more than two participants. Most soft crush fetishists avoid being placed under the same label as hard crush fetishists, believing that crush films with larger animals give the entire group a bad label. Gloryhole pornography features women performing fellatio on unidentified men through a small hole made in a bathroom divider. Transsexual people Transman pornography features performers who were born female and who medically transitioned to male. A few extremely flexible males can reach and stimulate gay bear porn their penis with their tongue or lips, and so perform autofellatio. Hardcore pornography is pornography that depicts penetration or extreme fetish acts, or both. A variant of A2M is ATOM where a performer inserts his penis directly from one recipient anus into a second recipient mouth. A female dominant in a master/slave relationship is often termed a Mistress, not horny milfs to be confused with the colloquial usage of mistress as a kept sexual partner without a similarly formalized power relationship. Bottom and submissive are widely recognized terms for those partner in the relationship or activity who are, respectively, the physically receptive or controlled participants. 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. In addition to mainstream pornography, gay hentai the popularity of facials has led to creation of its own niche market, like video series that specialize in showing the act. Lesbianism has been a theme in erotic art since at least the time of ancient Rome, and many regard depictions of lesbianism to be erotic. Although pornography has usually focused on heterosexuality, due to the prevalence of the heterosexual orientation, explicit gay material has a long history as well, which reaches back to Greek antiquity, if not to prehistory. Commercialized pornography accounts for a nearly US0 billion worldwide industry for the production of various media and associated products and services.