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. There are number of types of sex parties: Swinger party/gathering A swinger party or partner-swapping hentai sex party is a gathering at which individuals or couples in a committed relationship can engage in sexual activities with others as a recreational or social activity. Contrary to the other two types, B/D does not define the Tops and Bottoms itself, and is used to describe the general activities with either partner being the receiver and the giver. Pornography may fall into more than one genre. Some anthropologists and sociobiologists believe that breast fetishism derives from the breasts similarity to buttocks, but instead provide sexual attraction from the front of the body. Being forced to wear diapers as a form of humiliation is sometimes a behavior encountered in sexual masochism. In Japan, point of view pornography is referred to as hamedori . A study of the condom usage habits of New Zealand sex workers gay movies said that they offered various safe sex alternatives to vaginal sex to clients who refused to wear a condom. Internationally, hentai is a catch-all term to describe a genre of anime and manga pornography. Femdom features BDSM scenes in which the dominant partner is female. The activity is done by porn milf itself or as a part of or prelude to other activities which many times involve sex. Many transgender people regard the term shemale as offensive, arguing that it mocks or shows a lack of respect towards the gender identity and gender expression of transgender individuals; in this view, the term emphasizes the biological sex of a person and neglects their gender. His most famous model was Bettie Page, who became the first celebrity of bondage film and photography. Biological anthropologist Helen B. Clothed male, naked female is one-sided female nudity in which one or more females are nude while one or more men are clothed.