In the gay pornography industry, which uses amateurs as well as professional actors, the term gay-for-pay refers to actors labeled or believed to be straight but who engage in same-sex sexual activities for money. Use of the agreed safeword is seen by some as an explicit withdrawal of consent. 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. Though there have been numerous gang bang pornographic films since the 1980s, they usually involved no more than half a dozen to a dozen men. Both sexes sometimes apply lubricating substances to intensify sensation. John Stagliano is considered to have started the gonzo pornography genre with his Buttman series of films. 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. For some people, non-penetrative sex is the primary sexual activity of choice above all others. A sex party is a gathering at which sexual gay hentai activity takes place. In Japan, point of view pornography is referred to as hamedori . Barebacking usually refers to a conscious and deliberate choice to forgo condoms. Diaper fetishism is totally independent from pedophilia as the wearer videos porno gay derives pleasure only from the diaper and/or use of horny milfs it. Crush pornography features objects being crushed by an actress or actor, who generally plays an overtly dominant role. Pornography is often distinguished from erotica, which consists of the portrayal of sexuality with high-art aspirations, focusing also on feelings and emotions, while pornography involves the depiction of acts in a sensational manner, with the entire focus on the physical act, so as to arouse quick intense reactions. Bear features a combination of middle-aged, hairy or overweight males. Some masturbate only using pressure applied to the clitoris without direct contact, for example by pressing the palm or ball of the hand against underwear or other clothing.