Double penetration of the vagina, anus and mouth, can involve: Simultaneous penetration of the anus by two penises or other objects. In Japanese, this natural-fibre rope is known as asanawa; the Japanese vocabulary does not make a distinction between hemp and jute. Bondage/BDSM Bondage pornography features performers tied up or constrained in various ways. Examples of mentally oriented practices are education games, during which the dominant requires certain forms of behavior from the submissive. Bear features a combination of middle-aged, hairy or overweight males. The porn industry and viewing public were shocked by the then-taboo spectacle of a white woman having sex with a black man. This industry employs thousands of performers along with support and production staff. Female dominance refers to BDSM relationships and BDSM scenes in which the dominant partner is female. Since mammary intercourse is a non-penetrative sex act, the risk of passing a sexually transmitted infection that requires direct contact between the mucous membranes and pre-ejaculate or semen is greatly reduced. Transsexual young gay porn pornography is a genre of pornography. Use of the agreed safeword is seen by some as an explicit withdrawal of consent. Urolagnia is a form of salirophilia in which sexual excitement is associated with the sight or thought of urine or urination. Among swinging couples, one of the two partners is often the driving force and the other is more passive-supportive of the addition of additional sex parties. Interactive pornography, available in CD-ROM and DVD format, allows the viewer to select the particular acts performed at any one time, sometimes with the camera providing a first person view. Masturbation is the self-sexual stimulation of the genitals for sexual arousal or other sexual pleasure, usually to the point of orgasm. Lying face down on a comfortable surface such as a mattress or pillow, the penis can be rubbed against it. Older names for a pornographic film include stag hentai porn film, and blue movie.