This can, however, redirect semen into the bladder . The prostate gland is one of the organs that contributes fluid to semen. A variation on this is to place the fingers and thumb on the penis as if playing a flute, and then shuttle them back and forth. 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. Bisexual DVDs sell much better online than in adult video stores, possibly due to customers in stores feeling embarrassed to buy them. Animal masturbation has been gaysex observed in many species, both in the wild and in captivity. It spawned numerous hentai sex sequels, several of which won adult film awards. The genres of pornography are based on the type of activity featured and the category of participants, for example mateur pornography is a category of pornography that features models, actors or non-professionals performing without pay, or actors for whom this material is their only paid modeling work. Often, strong views are expressed with regard to anal sex; it is controversial in various cultures, especially with regard to religion, commonly due to prohibitions against anal sex among gay men or teachings about the procreative purpose of sexual activity. Usually that person prefers to stage the wetting so that his/her legs become soaked with naked milf urine. A pearl necklace is a slang term referring to a sexual act in which a man ejaculates semen on or near the neck, chest, or breast of another person. Dwarfs or midget pornography features performers who are dwarfs/midgets. Although interracial pornography theoretically can apply to depictions of sexual activity between performers of any different racial groups, the term is most commonly used for heterosexual sex acts between black and white performers. These scenes may either have the cameraman directly engaging in sex or merely filming others having sex. A crush fetish is a fetish in which one is sexually aroused usually when someone crushes objects, food, and sometimes small animals with their body, usually under their foot, or when crushed oneself.