Lesbian pornography typically features a wider range of appearances and body types than is typical of mainstream pornography. The current public acceptance of celebrities with sex tapes is speculated by Joe Levy, executive editor of Rolling Stone, to be due to the easy availability of pornography, as well as couples more commonly big tit milf making their own tapes due to the prevalence of video cameras. Smotherboxes are usually custom made pieces of furniture that may have a special significance for their users. The activity is done by itself or as a part of or prelude to other activities which many times involve sex. Sadism describes hentai videos sexual pleasure derived by inflicting pain, degradation, humiliation on another person or causing another person to suffer. The genre presents itself as real couples having real sex. Exhibitionism: Becoming noticeably gay sex video desperate or wetting oneself with the express purpose of being seen by strangers. Mutual masturbation foreplay The manual stimulation of each other genitals where the session eventually leads to sexual intercourse. They may regard it as an enhancing element of their sex lives or as their primary form of sexual activity. Lolita pornography that features actual teenage girls under the age of 18 is illegal in most countries and treated as child or youth pornography. Cartoon pornography depicts illustrated or animated fictional characters in erotic and sexual situations. The cover is open while the submissive lies down on his back and places his head in the box. Sadomasochism refers to the aspects of BDSM surrounding the exchange of physical or emotional pain. The introduction of the home video and Internet saw a boom in the worldwide porn industry that generates billions of dollars annually. In the 18th and 19th centuries, some European theologians and physicians described it as heinous, deplorable, and hideous, but during the 20th century, these taboos generally declined. Reality and voyeur pornography, animated videos, and legally prohibited acts also influence the classification of pornography.