The term sadomasochism is derived from the words sadism and masochism . 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. A somewhat controversial ejaculation control technique is to put pressure on the perineum, about halfway between the scrotum and the anus, just before ejaculating. Ass to mouth pornography shows the transfer of a performer penis from a second performer anus to that same second performer mouth in a single hentai videos shot. Urolagnia is a form of salirophilia in which sexual excitement is associated with the sight or thought of urine or urination. Hardcore pornography is pornography that depicts penetration or extreme fetish acts, or both. Sexual relations between women have been illustrated as well as narrated, but much of milf fuck the written material from the early modern period has been destroyed. Gay-for-pay describes male or female actors, pornographic stars, or sex workers who self-identify as heterosexual but who are paid to act or perform as homosexual professionally. Transsexual porn star Wendy Williams has stated that transsexual Porn is classified as Straight Specialty. A survey by the New York City Department of Health and Mental Hygiene found that heterosexual women are more likely to bareback when engaging in anal sex than homosexual and bisexual men. Commercialized pornography accounts for a nearly US0 billion worldwide industry for the production of various media and associated products and services. BDSM actions can often take place during a specific period of time agreed to by both parties, referred to as play, a scene or a session. Pornography may fall into more than one genre. A few extremely flexible males can reach and stimulate their penis with their tongue or lips, and so perform autofellatio. They further argue that setting a discrete line between safe and not-safe activities ideologically denies consenting adults the right to evaluate risks vs rewards for themselves; that some adults will be drawn to certain activities regardless of the risk; and that BDSM play—particularly higher-risk play or edgeplay—should be treated gay twink porn with the same regard as extreme sports, with both respect and the demand that practitioners educate themselves and practice the higher-risk activities to decrease risk.