Starting with erotic stories and woodblock prints from before the 20th century, Japanese pornography evolved into distinct subcategories with the media that in addition of pornographic videos and magazines featuring live actors, there is exist categories of pornographic manga , pornographic computer games , and pornographic anime . When sexual activity is centered on one of the threesome, then the activity may be described as a gang bang of the person. Incest pornography momsex can feature actual relatives, but the main type of this pornography simply uses actors of similar looks to suggest family relationship. Lucky Pierre is slang for a person performing both receptive and insertive anal and/or vaginal sex simultaneously during a threesome, being positioned between the two partners. Transsexual pornography features transwomen performers, who typically have male genitalia and augmented female breasts . Babysitter pornography features usually teenage girls being exploited and having taboo sex with gay boy porn older, male employers. Reflective of its views on sexuality and culture, Japanese pornography delves into a wide spectrum of heterosexual, homosexual, and transgender sexual acts in addition to unique fetishes and philias. It is mutual consent that makes a clear legal and ethical distinction between BDSM and such crimes as sexual assault or domestic violence. There were also a very limited number of specialist fetish magazines which featured images of bondage, such as the famous Bizarre magazine published from 1946 to 1959 by the pioneering fetish photographer John Willie, and ENEG Exotique magazine, published 1956-1959. Related genres include: Amateur pornography originally referred only to pornography produced by amateurs but now also includes professionally made pornography designed to appear as if it were amateur. Mutual masturbation can be practiced by males or females in pairs or groups with or without actually touching another person as indicated by the following examples of gay hentai contact versus non-contact scenarios: Non-contact mutual masturbation Two people masturbating in the presence of each other but not touching.