Simultaneous penetration of the mouth and either the vagina or anus. A crush fetish is a fetish in which one is sexually aroused usually when someone crushes objects, food, and sometimes small animals with their body, usually under their foot, or when crushed oneself. Pornography is often referred to as porn and a pornographic work as a porno. First found in softcore movies and erotic thrillers, depictions of lesbianism entered mainstream cinema in the 1980s. But starting with The World Biggest Gangbang , starring Annabel Chong, the pornographic industry milf fuck began producing a series of films ostensibly setting gangbang records for most consecutive sex acts by one person in a short period. Boot fetishism is a sexual fetish dedicated to boots. It is suggested that much of the obscurity and the uncertainties about female ejaculation are related to mixing up these two phenomena. For other scenes, particularly in established relationships, a safeword may be agreed to signify a warning rather than explicit withdrawal of consent; and a few choose not gay twinks to use a safeword at all. Can also include auto-fellatio, or performing oral sex on oneself. The term is a slang word that originated in the gay community and comes from the equestrian term bareback, 3d hentai which refers to the practice of riding a horse without a saddle. Since at least 1973, it has also been used to refer to a sexually attractive young woman. In the context of consensual erotic activities, sadism and masochism are not strictly accurate terms; there is a significant difference from the medical or psychological usage of both terms. Many men who like trans partners of any variety, known as tranny chasers, do not necessarily identify as gay themselves. Using the term shemale for a transsexual woman often implies that she is working in the sex trade. A male voyeur is commonly labeled Peeping Tom, a term which originates from the Lady Godiva legend. Gloryhole pornography features women performing fellatio on unidentified men through a small hole made in a bathroom divider.