Several hundred exclusively pegging films were produced, as well as twice as many bisexual and straight films with strap-on scenes. Because the viewing of such films carried a social stigma, they were viewed at brothels, adult movie theaters, stag hentai porn parties, at home, in private clubs and also at night cinemas. Evolutionary psychologists suggest that rounded buttocks gay boy porn may have evolved to be desirable trait because they provide a visual indication of the woman youth and fertility. Use of the agreed safeword is seen by some as an explicit withdrawal of consent. Pornography in Japan is large and intertwined business of adult entertainment with unique characteristics that readily distinguish it from western pornography. Sexual relations between women have been illustrated as well as narrated, but much of the written material from the early modern period has been destroyed. In modern BDSM vernacular, the queening stool allows open access to the crotch while seated. Works in this genre may be considered adult for any number of reasons. The term bondage describes the practice of Physical restraining. Femdom features BDSM scenes mature milfs in which the dominant partner is female. Sexual orientation Pornography features an increasing variety of combinations of actors by their sexual orientation such as lesbian, gay, bisexual, and transsexuals in addition to traditional heterosexual roles. Sometimes one or more fingers may be inserted into the vagina to stroke its frontal wall where the G-spot may be located. Some straight actors have started acting in gay porn only to be accused of being gay while others first step was to strictly do solo scenes. Compensating elements of the total dominance and submission are care and devotion complementing one another, thus facilitating stable relationships. Voyeur pornography may also include shots of topless women on topless beaches who are unaware of the cameras but may legally be photographed due to the public setting. Stimulating the prostate from outside, via pressure on the perineum, can be pleasurable as well.