A pornographic work is characterized as hardcore if it has any hardcore content, no matter how small. Its gain in prominence has been attributed to its depiction in the film Pecker, which was released in 1998. In the fetish cuckolding subculture, it is most common for the female to take on the sexually dominant role and the male the submissive role, however, female subs, sometimes referred to as cuckqueans, also exist. The act may be carried out face to face, or head to tail, with the woman recommended to be on top if she has smaller breasts. In Canada, Teletoon offers up its own Teletoon at Night programming block. Preggo pornography features pregnant performers and may include erotic lactation as a fetish. The term sadomasochism is derived from the words sadism and masochism . 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. Lolita pornography features women who are 18 years old or slightly older, who pretend to be underage teen girls. For circumcised gay twink porn males, on whom the glans is mostly or completely uncovered, this technique creates more direct contact between the hand and the glans. If one person is penetrated by two objects, lesbian milfs it is generically called double penetration gay hentai . What seems clear from the historical record is that much of the lesbian material in pornographic texts was intended for a male readership. 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. Some women who engage in same-sex sexual activity may reject not only identifying as lesbians but as bisexual as well, while other women self-identification as lesbian may not align with their sexual orientation or sexual behavior; sexual identity is not necessarily the same as one sexual orientation or sexual behavior, due to various reasons, such as the fear of identifying their sexual orientation in a homophobic setting.