The term applies to the depiction of the act rather than the act itself, and so does not include live exhibitions like sex shows and striptease. Participants usually derive pleasure from this, even though many of the practices—such as inflicting pain or humiliation or being restrained—would be unpleasant under other circumstances. Lesbianism has been a theme in erotic art since at least the time of ancient Rome, and many regard depictions of lesbianism to be erotic. 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 . These scenes may involve the female actor calling for the shot to be directed at some specific part of her body. Many men who like trans partners of any variety, known as tranny chasers, do not gay sex videos necessarily identify as gay themselves. In more vigorous forms of fisting, such as punching or punchfisting, a fully clenched fist may be inserted and withdrawn slowly. Gloryhole pornography features women performing fellatio on unidentified men through a small hole made in a bathroom divider. The name is a reference to gonzo journalism, in which the reporter is part of the event taking place. The name of the practice, when it is done in a repeated in-and-out motion, is derived from its passing resemblance to the dipping of a tea bag into a cup of hot water as a method of brewing tea. Since the 1980s, many practitioners and organizations have adopted the motto safe, sane and consensual, commonly abbreviated as SSC, which means that everything is based on safe activities, that all participants be of sufficiently sound/sane mind to consent, and that all participants do consent. The original definition of dogging – and which is still a closely related activity – is spying on couples having sex in a car or other public place. Examples include the Girls Gone Wild and Girls Who Like Girls Series.