Initially, few animation studios in the United States attempted to produce animation for adult audiences, but later examples of animation produced for adults would gain mainstream attention and success. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. This is commonly called double anal or double stuffing. Generally, interest differs between people, and gender depends on sexual gay sex videos orientation. It is sometimes described as a sexual fantasy, by women or men, depicting an exhibitionist or physique worship scenario. Shemale is a term primarily used in sex work to describe a trans woman with male genitalia combined with female secondary sex characteristics, usually including augmented female breasts, from breast augmentation and/or use of hormones. Transsexual porn star Wendy Williams has stated that transsexual porn is classified as Straight Specialty. Especially popular in post-World War 2 Japanese culture. Boot fetishism is a sexual fetish dedicated to boots. When sexual activity is centered on one of the threesome, then the activity may be described as a gang bang of the person. Fisting pornography features the insertion of an entire hand into a performer vagina or anus. Given the wide range of practices, some of which may be engaged in by people who do not consider themselves as practicing BDSM, inclusion in the BDSM community or subculture is usually dependent on self-identification and shared experience. Bareback sex is physical sexual activity, especially sexual penetration, without the use of a condom. A variant of this is known as ATOM or ATOGM where the insertive partner removes his penis from one recipient anus and inserts it into a second recipient mouth. In gay pornographic movies, actors who identify themselves as heterosexual, but who nevertheless perform explicit sexual acts with other males on film do not face the same stigmas as the mainstream acting counterparts and indeed can rise quickly to being featured actors.