If this is done using penises and/or strap-on dildos, this is sometimes called the sandwich or BigMac. Watersports pornography features sexual activities involving urine, such as golden showers. Mammary intercourse is said by Alex Comfort to produce mutual orgasm in women with sensitive breasts , and it was one of the nine substitute exercises for penetrative sexual activities, as detailed in the Paradis Charnels of 1903. This style of filming is in contrast to having a separate, third-person camera crew filming all the action. This technique may include the use of a simulacrum, lesbian hentai or artificial vagina. The related term twinkle-toes, which implies that a man is effeminate, tends to be used in a derogatory manner. People may engage in anilingus for its own sake, before anal fingering or penetration, or as part of foreplay. Transsexual pornography videos porno gay is a genre of pornography. Performers are usually clean-shaven, thinner and more effeminate than ones in mainstream gay pornography. It is mutual consent that makes a clear legal and ethical distinction between BDSM and such crimes as sexual assault or domestic violence. Originating in Japan in the 1980s, the genre subsequently spread to North America and Europe, and crossed over into gay pornography. Even though the performers who perform in these films typically appear on many reality websites within a short span of time, most of these websites claim that each of them is an amateur. The object or situation of interest is called the fetish; the person who has a fetish for that object/situation is a fetishist. Ass to mouth pornography shows the transfer of a performer penis from a second performer anus to that same second performer mouth in a single shot. Depictions of male and female masturbation are common in pornography, including gay pornography. The phrase nude milfs is commonly found on porn sites. Softcore gay pornography also exists; it at one time constituted the genre, and may be produced as beefcake pornography for heterosexual female and homosexual male consumption.