Its primary goal is sexual arousal in its audience. Double Stuffed , Double Vaginal , or Double Anal pornography involves the penetration of one orifice by two penises or other objects. The term applies to the depiction of the act rather than the act itself, and so does not include live exhibitions gay movies like sex shows and striptease. Since development and pronunciation of the buttocks begins at menarche and declines with age, full buttocks are also a symbol of youth. 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. The work of Bruce Seven has been called reality porn, due to his hentai porn lack of using scripts and asking his performers to act naturally in their own character. This style of filming is in contrast to having a separate, third-person camera crew filming all the action. These scenes may either have the cameraman directly engaging in sex or merely filming others having sex. The term lesbian is also used with regard to sexual identity or sexual behavior, regardless of sexual orientation, or as an adjective to characterize or associate nouns with female homosexuality or same-sex attraction. 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. Bottom and submissive are widely recognized terms for those partner in the relationship or activity who are, respectively, the physically receptive or controlled participants. Although pornography has usually focused on heterosexuality, due to the prevalence of the heterosexual orientation, explicit gay material has a long history as well, which reaches back to Greek antiquity, if not to prehistory. A sex party is a gathering at which sexual activity takes place. People may engage in anilingus for its own sake, before anal fingering nude milfs or penetration, or as part of foreplay.