If one person is penetrated by two objects, it is generically called double penetration . Both forms of pornography generally contains nudity. Pornography in Japan is large and intertwined business of adult entertainment with unique characteristics that readily distinguish it from western pornography. For some people, non-penetrative sex is the primary sexual activity of choice above all others. The volume of semen that is ejaculated depends on several factors, including the male health, age, degree of sexual excitement, and the time since his last ejaculation. Portrayals of lesbians in the media suggest that society at large has been simultaneously intrigued and threatened by women who challenge feminine gender roles, and fascinated and appalled with women who are romantically involved with other women. 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. Internal ejaculation shots are a comparatively recent development in pornography; they are not found in early pornographic films. Stimulating the prostate from outside, via pressure on the perineum, can be pleasurable as well. Specific sex acts Anal Anal pornography features anal penetration with a penis, dildo, other objects, or some combination of them. The reverse of this, in which nude women interact with clothed men, is called Clothed male, naked female . In general, BDSM play is usually structured such that it is possible for the consenting partner to withdraw his or her consent during a scene; for example, by using a safeword that was agreed on in advance. On May 27, 2010 the television program The Doctors discussed gay hentai the topic with dozens of teens, parents, young gay porn and professionals. Mammary intercourse is a sex act, performed as foreplay or as non-penetrative sex, that involves the stimulation of the male penis by the female breasts and vice versa. In Japanese, this natural-fibre naked milf rope is known as asanawa; the Japanese vocabulary does not make a distinction between hemp and jute.