Terminology for roles varies widely within the various BDSM subcultures. The term discipline describes psychological restraining, with the use of rules and punishment to control overt behavior. Pornography is often referred to as porn and a pornographic work as a porno. A facial is a form of non-penetrative sex, though it is generally performed after some other means gay video of sexual stimulation, such as vaginal sex, anal sex, oral sex or masturbation. The person receiving anilingus is regarded as the passive partner in the act, and the person performing anilingus is the active partner. These scenes may either have the cameraman directly engaging in sex or merely filming others having sex. Kinbaku means tight binding Kinbaku-bi which literally means the beauty of tight binding. Actual upskirt or downblouse shots may violate privacy laws in some countries. A variant of A2M is ATOM where a performer inserts his penis directly from one recipient anus into a second recipient mouth. In modern BDSM vernacular, the queening stool allows open access to the crotch while seated. The term soft crush refers to the more common fetish surrounding videos involving inanimate objects or small invertebrates being crushed, while the term hard crush refers to such videos involving larger animals with vertabrae, and arguably more pain-susceptible animals . This stop and go build-up, known as edging, can achieve even stronger orgasms. BDSM communities generally welcome anyone with a non-normative streak who identifies with the community; this may include cross-dressers, extreme body mod enthusiasts, animal players, latex or rubber aficionados, and others. A celebrity may allow such a recording to surface willingly, as part of a publicity stunt. Transsexual porn star Wendy Williams has stated that transsexual porn is classified as Straight Specialty. Mutual masturbation can be practiced by males or females in pairs or groups with or without actually touching another person as indicated by the following examples of contact versus non-contact scenarios: Non-contact mutual masturbation Two people masturbating in the presence of each other but not touching.