The full-weight body-pressure, moisture, sex odors and darkness can be perceived as powerful sexual attractions or compulsions. Pornography may fall into more than one genre. Women oriented pornography is sometimes referred to gaysex as sex positive pornography. Some people get sexual pleasure by inserting objects, such as urethral sounds, into the urethra , a practice known as urethral play or sounding. Specific sex acts Anal Anal pornography features anal penetration with a penis, dildo, other objects, or some combination of them. The porn industry and viewing public were shocked by the then-taboo spectacle of a white woman having sex with a black man. Femdom features BDSM scenes in which the dominant partner is female. Barebacking usually refers to a conscious and deliberate choice to forgo condoms. Sadism describes sexual pleasure derived by inflicting pain, degradation, humiliation on another person or causing another person to suffer. In S/M, the Sadist is usually the Top and the Masochist the Bottom, but these roles are frequently more complicated or jumbled . Mammary lesbian milfs intercourse is known as titty-fucking, titfuck, or a titjob in the United States, as well as tit wank or French fuck in the United Kingdom - the latter term dating back to the 1930s; while a more hentai movies jocular equivalent is a trip down mammary lane. Yaoi is anime or manga that features gay males . To avoid soreness from this resulting friction, some may prefer to use a personal lubricant, masturbation cream or saliva during masturbation. In POV porn, the shooting style is generally similar to gonzo pornography, with the person receiving sexual gratification holding the camera him or herself—aiming it down at the actress or actor who is performing the sex act. 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. Group sex pornography features at least two men and two women , usually more, who all perform sex acts on each other.