The term pearl necklace is used by some because the drops of semen deposited by the man resemble a necklace of translucent white pearls. In Canada, big tit milf Teletoon offers up its own Teletoon at Night programming block. Mammary intercourse is known as 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 lesbian hentai back to the 1930s; while a more jocular equivalent is a trip down mammary lane. Throughout history, women have not had the same freedom or independence to pursue homosexual gaysex relationships as men, but neither have they met the same harsh punishment as homosexual men in some societies. Double Stuffed , Double Vaginal , or Double Anal pornography involves the penetration of one orifice by two penises or other objects. Preggo pornography features pregnant performers and may include erotic lactation as a fetish. Real medical shots or videos may violate privacy laws in some countries. Examples of heterosexual pornographic film series featuring creampies include Cream Filled Teens and Internal Cumbustion. Double penetration of the vagina, anus and mouth, can involve: Simultaneous penetration of the anus by two penises or other objects. Interactive pornography, available in CD-ROM and DVD format, allows the viewer to select the particular acts performed at any one time, sometimes with the camera providing a first person view. Yaoi is anime or manga that features gay males . Macrophilia is a fascination with or a sexual fantasy involving giants, more commonly expressed as giantesses . In some scenes or relationships it may be impossible for consent to be withdrawn in the middle of a scene, or the bottom may have the ability to revoke consent for a relationship as a whole, but not for a particular scene. 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.