Men may find stimulation of the anus, rectum, and adjacent organs enjoyable. Women oriented pornography is sometimes referred to as sex positive pornography. Foot fetish pornography features heavy emphasis on the feet of the participants, either in combination with kissing and genital sex or in the context of acts such as trampling or crush fetishism. Specific sex acts Anal Anal pornography features anal penetration with a penis, dildo, other objects, or some combination of them. Normal quantities of ejaculate range from 1.5 to 5.0 milliliters . Both sexes sometimes apply lubricating substances to intensify sensation. In modern BDSM vernacular, the queening stool allows open access to the crotch while seated. These scenes may involve the female actor calling for the shot to be directed at some specific part of her body. Pregnancy fetishism is a context where hentai videos pregnancy is seen by individuals or cultures lesbian milfs as an erotic phenomenon. Evolutionary psychologists suggest that rounded buttocks may have evolved to be desirable trait because they provide a visual indication of the woman youth and fertility. Jerk off instruction features a performer encouraging or instructing the viewer to masturbate, often culminating in a countdown at the end of which the viewer is invited to induce orgasm. 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. Transsexual porn star Wendy Williams has stated that transsexual Porn is classified as Straight Specialty. Sadomasochism is practiced in isolation relatively rarely, though some masochists report biting, pinching, or even stun-gunning themselves as a prelude to, or as part of, masturbation. Since development and pronunciation hot gay sex of the buttocks begins at menarche and declines with age, full buttocks are also a symbol of youth. This can, however, redirect semen into the bladder . The phrase buttered bun is sometimes used to refer to the owner of the orifice in question.