Types of anal sex can also be a part of lesbian sexual practices. Felching is a sexual practice involving the act of orally sucking semen out of the vagina or anus of one partner. Hardcore pornography is pornography that depicts penetration or extreme fetish acts, or both. Women oriented pornography is sometimes referred to as sex positive pornography. Lolicon and its contribution to the controversy regarding the regulation of pornography of depicting minors that don’t exist has been a major issue for free speech in and outside of Japan. The most common type of erotic spanking is administered on the bare buttocks, but can also be hentai videos combined with bondage, in order to heighten sexual arousal and feelings of helplessness. As a form of non-penetrative sex, it can be done for its own enjoyment or as foreplay. Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds. Double penetration of the vagina, anus and mouth, can involve: Simultaneous penetration of the anus by two penises or other objects. Sadomasochism is practiced in isolation relatively rarely, though some masochists report biting, pinching, or even stun-gunning themselves as a prelude to, or as part of, masturbation. Reality and voyeur pornography, animated videos, and legally prohibited acts also influence the classification of pornography. Sexual orientation Pornography features an increasing gay sex video variety of combinations of actors by momsex their sexual orientation such as lesbian, gay, bisexual, and transsexuals in addition to traditional heterosexual roles. It is also followed by dedicated industry publications and trade groups as well as the mainstream press, private organizations , government agencies, and political organizations. Women with women Main article: Lesbianism in erotica: Lesbianism in contemporary pornography Lesbian or girl-girl pornography features women engaged in sex together, but is typically aimed at a male audience.