Yaoi is anime or lesbian hentai manga that features gay males . Arcane or occult pornography involves sexualized situations with an occult or magical tone or performers who costume themselves in keeping with the theme, for example, a male performer dressed as a wizard. Some straight actors have started acting in gay porn only to be accused of being gay while others first step was to strictly do solo scenes. Additionally, the buttocks give an indication of the shape and size of the pelvis, which impacts reproductive capability. Evolutionary psychologists suggest that rounded buttocks may have evolved to be desirable trait because they provide a visual indication of the woman youth and fertility. For some people, non-penetrative sex is the primary sexual activity of choice above all others. Women with women Main article: Lesbianism in erotica: Lesbianism in contemporary pornography Lesbian or girl-girl pornography features women engaged in sex milf xxx together, but is typically aimed at a male audience. Those with diaper-related paraphilias differ widely in their focus of attention. These styles are much closer to the style of bondage scenes in mainstream television. The loose and direct camera work often includes tight shots of the genitalia, unlike some traditional porn. John Stagliano is considered to have started the gonzo pornography genre with his Buttman series of films. Works in this genre may be considered adult for any number of reasons. Some people get sexual pleasure by inserting objects, such as urethral gaysex sounds, into the urethra , a practice known as urethral play or sounding. This makes varying degrees of stimulation an integral part of oral sex for many men. While some fantasize about a giantess who is slightly taller than himself, others are interested in giantesses that are hundreds or even thousands of feet tall. Crush pornography features objects being crushed by an actress or actor, who generally plays an overtly dominant role. Internal ejaculation shots are a comparatively recent development in pornography; they are not found in early pornographic films.