Sexual relations between women have been illustrated as well as narrated, but much of the written material from the early modern period has been destroyed. 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. 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. Threesome can also refer to a love triangle, a three-way romantic relationship. The range of its individual characteristics is thereby wide. In Canada, Teletoon offers up its own Teletoon at Night programming block. Hamedori is a genre of Japanese pornography in which a male adult video actor or director serves as the camera operator. Bara male homosexual hentai designed to appeal to men. Examples of heterosexual pornographic film series featuring creampies include Cream Filled Teens and Internal Cumbustion. 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. Sometimes one or more fingers may be inserted into the vagina to stroke its frontal wall where the G-spot may be located. Sexual orientation Pornography features an increasing variety of combinations of actors by their sexual orientation such as lesbian, gay, bisexual, and transsexuals in addition to traditional heterosexual roles. The use of the word creampie to describe such scenes originated in U. Adult anime hentai animation is genre of animation geared towards adults and sometimes teens. The term gay cock sadomasochism is derived from the words sadism and masochism . Pornographic films are typically categorized as either milf fuck softcore or hardcore pornography. Commercialized pornography accounts for a nearly US0 billion worldwide industry for the production of various media and associated products and services.