Going back at least as far as the Christy twins in the 1970s, depictions of incest and particularly incest between twins has been a feature of gay pornography. Guro or Gore is a genre of Japanese pornography involving blood, gore, disfiguration, gay twink porn violence, mutilation, urine, enemas, or feces. Arousal may be triggered by seeing the body movements or facial expressions of that person. Said that the female buttocks evolved in the context of females competing for the attention and parental commitment of powerful resource-controlling males as an honest display of fat reserves that could not be confused with another type of tissue, although T. Omorashi: The act of holding one own urine until the need to urinate is urgent, making another hold in their urine, or watching another person with an urgent need to urinate. Transsexual pornography features transwomen performers, who typically have male genitalia and augmented female breasts . 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. The term lesbian is also used with regard to sexual identity or sexual behavior, regardless of sexual orientation, or as an adjective to characterize or associate nouns with female homosexuality or same-sex attraction. Pornographic hentai porn films present sexual fantasies and usually include erotically stimulating material such as nudity. First found in softcore movies and erotic thrillers, depictions of lesbianism entered mainstream cinema in the 1980s. The padding may also muffle noises from the outside, causing a relaxation effect and heightening their other milf xxx senses. A variation on this is to place the fingers and thumb on the penis as if playing a flute, and then shuttle them back and forth. Along with the penis, the scrotum is sensitive and considered to be an erogenous zone. The rise of the Internet in the late 1990s and early 2000s similarly changed the way pornography film was distributed and furthermore complicated the censorship regimes around the world and the legal prosecution of obscenity.