Hamedori is a genre of Japanese pornography in which a male adult video actor or director serves as the camera operator. Barebacking usually refers to a conscious and deliberate choice to forgo condoms. Examples of heterosexual pornographic film series featuring creampies include Cream Filled Teens and Internal Cumbustion. Films with risqué content commenced to be produced soon after the invention of the motion picture in the 1880s. Other objects such hot gay sex as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection. A woman can use a secondary vibrator, between the dildo and her genitals, to get pleasure from pegging. Clothed male, naked female is one-sided female nudity in which one or more females are nude while one or more men are clothed. Dwarfs or midget pornography features performers who are dwarfs/midgets. Foot fetishism has been defined as a pronounced sexual interest in the feet or footwear. Terminology for roles varies widely within the various BDSM subcultures. Concerted deployed sexual rejection exercised on the partner can be an aspect of Dominance and Submission as well. Bukkake is a sex act portrayed in pornographic films, in which several men ejaculate on a woman, or another man. On May 27, 2010 the television program The Doctors discussed the topic with dozens of teens, parents, and professionals. Mutual masturbation, mutual manual stimulation of the genitals between hentai movies partners, can be a substitute for sexual penetration. The act may be carried out face to face, or head to tail, with the woman recommended to be on top if she has smaller breasts. Pornography in Japan is large and intertwined business of adult entertainment with unique characteristics that readily distinguish it from western pornography. The term pearl necklace is used by some because the drops of semen deposited by the man resemble a necklace of translucent white momporn pearls. Particular areas and processes of the body that change during pregnancy may also become the focus of psychological investment, but nudity or sexual activity is not always essential, and in some cases actual pregnancy is not necessary to invoke arousal.