Given the wide range of practices, some of which may be engaged in by people who do not consider themselves as practicing BDSM, inclusion in the BDSM community or subculture is usually dependent on self-identification and shared experience. Unlike erotic films, pornographic films contain momporn explicit sexuality and do not claim any artistic merit. Transsexual people Transman pornography features performers who were born female and who medically transitioned to male. Male masturbation may differ between males who have been circumcised and those who have not. It can be combined with fellatio and the woman may move her breasts up and down on the penis for an additional stimulation, usually before the man reaches orgasm. The name of the practice, when it is done in a repeated in-and-out motion, is derived from its passing resemblance to the dipping of a tea bag into a cup of hot water as a method of brewing tea. For uncircumcised males, stimulation of the penis in this way comes from the pumping of the foreskin, in which the foreskin is held and slid up and down over the glans, which depending on foreskin length, is completely or partially covered and then uncovered in a rapid motion. Sub-genres of Japanese porn Among the various sub-genres of Japanese pornography are the following: Lolicon ロリコン: This genre involves prepubescent and adolescent girls between the aged of 6-12. Others may also use vibrators and other sexual devices more commonly associated with female masturbation. Can also include auto-fellatio, or performing oral sex on oneself. While most tentacle gay twinks erotica is animated, there are also a few live-action movies. Consent is the most important criterion here. Gloryhole pornography features women performing hentai videos fellatio on unidentified men through a small hole made in a bathroom divider. Unlike the traditional definition of the term, in fetish usage a cuckold is complicit in their partner sexual infidelity and takes masochistic sexual pleasure in it. Some productions are noted for sophisticated and/or experimental storytelling and animation techniques.