Diseño y Desarrollo: NewSolution IT, Pro-am pornography is sub-genre of amateur pornography that refers to professionally made porn that features amateur actors/actresses, often appearing for the first time in a pornographic film. Since mammary intercourse is a non-penetrative sex act, the risk of passing a sexually transmitted infection that requires direct contact between the mucous membranes and pre-ejaculate or semen is greatly reduced. Femdom features BDSM scenes in which the dominant partner is female. Clothed female, naked male pornography features naked men and clothed women; typically, the women humiliate and abuse the men or perform fellatio and/or handjobs on the men. Participants who exert sexual control over their partners are known as dominants milf hd or tops while participants who take the passive, receiving, or obedient role are known as submissives or bottoms. Cuckolding can also be mixed with other non-monogamous relationship arrangements with which it has substantial overlap such as Swinging, wife-swapping, open relationships, and polyamory, etc. Examples of mentally oriented practices are education games, during which the dominant requires certain forms of behavior from the submissive. Both sexes sometimes apply lubricating substances to intensify sensation. The queening stool is also related to a smotherbox, which also allows the person under the seat to be locked in place, restrained by the neck as in a set of stocks. 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. Typically featured are hitting, choking, name-calling and hair-pulling. Works in this genre may be considered adult for any number of reasons. A 2009 study found that heterosexual male fat admirers preferred females that were clinically overweight and rated both overweight and obese women more positively than slighter individuals. Masturbation is the self-sexual stimulation of the genitals for sexual arousal or other sexual pleasure, usually to the point of orgasm. David S. Brey