The most common male masturbation technique is simply to hold the penis with a loose fist and then to move the hand up and down the shaft. Hardcore pornography is pornography that depicts penetration or extreme fetish acts, or both. Boots are seen as the perhaps most fetishistic of all footwear and boots may be the most popular fetish clothing attire. Terminology lesbian hentai for roles varies widely within the various BDSM subcultures. 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. Some are aroused from wetting their diapers, others like messing their diapers. In the fetish cuckolding subculture, it is most common for the female to take on the sexually dominant role and the male the submissive role, however, female subs, sometimes referred to as cuckqueans, also exist. Both sexes sometimes apply lubricating substances to intensify sensation. Men may also rub or massage the glans, the rim of the glans, and the frenular delta. Diaper pornography involves performers gaysex wearing diapers, sometimes with an adult performer acting in the role of a caretaker. It is also followed by dedicated industry publications and trade groups as well as the mainstream press, private organizations , government agencies, and political organizations. Some pornographic mature milfs films use an artificial semen substitute to simulate or enhance creampie shots. Works in this genre may be considered adult for any number of reasons. 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. A related term used in the genre is the term cougar, which implies an older woman as predator. In humans, females generally have more round and voluptuous buttocks, caused by estrogen that encourages the body to store fat in the buttocks, hips, and thighs. Felching is a sexual practice involving the act of orally sucking semen out of the vagina or anus of one partner.