However, the tradition of bondage magazines continues in the form of art books of bondage photographs, published by mainstream publishers such as Taschen. They cited the Internet and text messaging as common ways of organising meetings. Guro or Gore is a genre of Japanese pornography involving blood, gore, disfiguration, violence, mutilation, urine, enemas, or feces. One-sided male nudity can also arise when a male disrobes as part of a male striptease. Technically this is a form of exhibitionism rather than group sex per se. It may involve sexual attraction to women who are pregnant or appear pregnant, attraction to lactation, or attraction to particular stages of pregnancy such as impregnation or childbirth. Although pornography has usually focused on heterosexuality, due to the prevalence of the heterosexual orientation, explicit gay material has a long history as well, which reaches back to Greek antiquity, if not to prehistory. Bhabha, hentai movies Anne McClintock and Kobena Mercer. Men and women may masturbate until they are close to orgasm, stop for a while to reduce excitement, and then resume masturbating. Interracial pornographic films have experienced an explosion in popularity, becoming one of the fastest-growing and biggest-selling genres. Interracial pornography typically employs ethnic and racial stereotypes in its depiction of performers and many of interracial pornographic films still include racial stereotypes, although the segregation of actors by race has diminished considerably. Sexual scenarios may involve male domination, female submission, exhibitionism and erotic entertainment. Squirt pornography involves women ejaculating. Fisting may be performed with or without a partner. A variant of this is known as ATOM or ATOGM where the mature milfs insertive partner removes videos porno gay his penis from one recipient anus and inserts it into a second recipient mouth. Masturbation has been depicted in art since prehistoric times and is mentioned and discussed in very early writings. It may be regarded as taboo or unnatural, and is a criminal offense in some countries, punishable by corporal or capital punishment; by contrast, people also regard anal sex as a natural and valid form of sexual activity that may be as equally fulfilling as any other desired sexual expression.