Female dominance refers to BDSM relationships and BDSM scenes in which the dominant partner is female. Oral sex pornography frequently features a person performing fellatio, and less frequently cunnilingus. The phrase buttered bun is sometimes used to refer to the owner of the orifice in question. Sometimes one or more fingers may be inserted into the vagina to stroke its frontal wall where the G-spot may be located. Often, strong views are expressed with regard to anal sex; it is controversial in various cultures, especially with regard to religion, commonly due to prohibitions against anal sex among gay men or teachings about the procreative purpose of sexual activity. Some anthropologists and sociobiologists believe that breast fetishism derives from the breasts similarity to buttocks, but instead provide sexual attraction from the front of the body. It is also known colloquially as gushing or squirting, although these are considered to be different phenomena in some research publications. Both sexes sometimes apply lubricating substances to intensify sensation. Terminology for roles varies widely within the various BDSM subcultures. Incest itself is largely taboo, and is a crime in many countries. This makes varying degrees of stimulation an integral part of oral sex for many men. Although there may be no connection between coprophilia and sadomasochism , the limited data on the former milf fuck comes from studies of the latter. Voyeur pornography may also include shots gay twink porn of topless women on topless beaches who are unaware of the cameras but may legally be photographed due to the public setting. Buttocks are sometimes emphasized in pornography, where they are often referred to as booty. Barebacking usually refers to a conscious and deliberate choice to forgo condoms. Common positions include 3d hentai lying on back or face down, sitting, squatting, kneeling or standing. In academic discourse, racial fetishism is a postcolonialist term found in the writings of authors such as Homi K.