Irrespective of the legal or social view of pornography, it has been used in a number of contexts. Preggo pornography features pregnant performers and may include erotic lactation as a fetish. For instance, Amateur Allure has a trademark shot where the sexually performing cameraman gaysex circles a handycam around the sexually performing model head. 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. Barebacking usually refers to a conscious and deliberate choice to forgo condoms. 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. Foot fetishism has been defined as a pronounced sexual interest in the feet or footwear. As a form of non-penetrative sex, it can be done for its own enjoyment lesbian hentai or as foreplay. A bisexual threesome may involve a man having sex with a man and a woman, the woman having sex with a man and a woman, or all three having sex with each other. A study of the condom usage habits of New Zealand sex workers said that they offered various safe sex alternatives to vaginal sex to clients who refused to wear a condom. 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. Those with diaper-related paraphilias differ widely in their focus of attention. Clothed male, naked female is one-sided female nudity in which one or more females are nude while one or more men are clothed. On the other hand, the masochist enjoys being hurt, humiliated, or suffering within the consensual scenario. While anal sex is commonly associated with male homosexuality, research shows that not all gay males engage in anal sex and that it is not uncommon in heterosexual momsex relationships.