Milking pornography features lactating women being milked or milking themselves . This type of pornography is almost exclusively hentai, as true hermaphroditic humans are not fertile and are not usually found in nature. Some masturbate only using pressure applied to the clitoris without direct contact, for example by pressing the palm or ball of the hand against underwear or other clothing. Production of such films was profitable, and a number of producers specialised in their production. Reality and voyeur pornography, animated videos, and legally prohibited acts also influence the classification of pornography. In the gay pornography industry, which uses amateurs as well as professional actors, the term gay-for-pay refers to actors labeled or believed to be straight but who engage in same-sex sexual activities for money. The term breast fetishism is also used to refer to cultural attention to female breasts and the sexuality they represent, with debate continuing as to whether the modern widespread fascination with breasts among heterosexual males in western societies is a sexual fetish. They may be noted for using risqué themes, graphic violence, sexuality or black comedy in a manner that is unsuitable for younger audiences. Among swinging couples, one of the two partners is often the driving force and the other is more passive-supportive of the addition of additional sex parties. The fantasy is typically based around one gay movies or more larger beings dominating a smaller being. Mammary intercourse is known as momporn 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 jocular equivalent is a trip down mammary lane. If one person is penetrated by two objects, it is generically called double penetration . While some fantasize about anime hentai a giantess who is slightly taller than himself, others are interested in giantesses that are hundreds or even thousands of feet tall.
