What seems clear from the historical record is that much of the lesbian material in pornographic texts was intended for a male readership. If one person is penetrated by two objects, it is generically called double penetration . As a form of non-penetrative sex, it can be done for its own enjoyment or as foreplay. Internal ejaculation shots are a comparatively recent development in pornography; they are not found in early pornographic films. 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. Contrary to the other two types, B/D does not define the Tops and Bottoms itself, and is used to describe the general activities with either partner being the receiver and the giver. Snowballing or snowdropping is the human sexual practice in which one person takes someone else semen into his or her mouth and then passes it to the mouth of the other, usually through kissing. Threesome lesbian hentai can also refer to a love triangle, a three-way romantic relationship. There has been an increase in discussion and portrayal of masturbation in art, popular horny milfs music, television, films, and literature. In POV porn, the shooting style is generally similar to gonzo pornography, with the person receiving sexual gratification holding the camera him or herself—aiming it down at the actress or actor who is performing the sex act. The glans itself may widen and lengthen as the stimulation continues, becoming slightly darker in colour, while the gliding action of the foreskin reduces friction. For example, in Australia it is rated Refused Classification gay cock . The term combines elements of the Freudian psychoanalytic fetish and the Marxist commodity fetish, and is used in the context of British, Spanish and French colonialism and imperialism and their aftereffects. Today, religions vary in their views of masturbation; some view it as a spiritually detrimental practice, some see it as not spiritually detrimental, and others take a situational view.