As a result, little in history was documented to give an accurate description of how female homosexuality is expressed. The porn industry and viewing public were shocked by the then-taboo spectacle of a white woman having sex with a black man. Men may find stimulation of the anus, rectum, and adjacent organs enjoyable. Incest big tit milf itself is largely taboo, and is a crime in many countries. Many cultures describe pain as an aphrodisiac. However, bisexual pornography is often placed near the gay section in adult video stores, since many consumers are gay men. Simultaneous penetration of the mouth and either the vagina or anus. A celebrity may allow such a recording to surface willingly, as part of a publicity stunt. For legal reasons, the vast majority of so-called reality porn involves professional actors and actresses posing as so-called amateurs. Bestiality is illegal in many countries. Dwarfs or midget pornography features performers who are dwarfs/midgets. Female dominance refers to videos gays BDSM relationships and BDSM scenes in which the dominant partner is female. The phrase is commonly found on porn sites. Tentacle erotica can be consensual, but frequently contains elements of non-consensual sex. Snuff pornography involves the actual death of any of the participants, consenting or otherwise, simulated death is not considered snuff. This industry employs thousands of performers along with support and production staff. Bisexual pornography is a genre of pornography which most typically depicts one woman and two men who all perform sex acts on each other. If this is done hentai porn using penises and/or strap-on dildos, this is sometimes called the sandwich or BigMac. The term applies to the depiction of the act rather than the act itself, and so does not include live exhibitions like sex shows and striptease. It is typically animated pornography, as the legal age to be featured in a pornographic film in Japan is 18. Sexologist Alfred Kind suggested that the buttocks is the primary sexual presentation site in primates.