Hardcore pornography is pornography that depicts penetration or extreme fetish acts, or both. In Japanese, this natural-fibre rope is known as asanawa; videos gays 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. The naked appearance of actress Demi Moore in the advanced stage of pregnancy on the cover of Vanity Fair magazine in 1991 marked the beginning of a period which has since seen pregnancy presented by celebrities as a glamorous state of living, while also creating a market for photographers to produce images of pregnant mothers, and for fashion stylists hentai sex to introduce pregnancy styling to their business. It is geared towards heterosexual men, who most typically define a threesome as such. Sub-genres naked milf can also be classified into the characteristics of the performers or the type of sexual activity on which it concentrates, and not necessarily on the market to which each sub-genre appeals. 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. If one person is penetrated by two objects, it is generically called double penetration . For circumcised males, on whom the glans is mostly or completely uncovered, this technique creates more direct contact between the hand and the glans. In modern BDSM vernacular, the queening stool allows open access to the crotch while seated. The most common type of erotic spanking is administered on the bare buttocks, but can also be combined with bondage, in order to heighten sexual arousal and feelings of helplessness. This makes varying degrees of stimulation an integral part of oral sex for many men. 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. When the interest in a particular subject is obsessive, the behavior may be described as stalking.