Another variant of reality pornography consists of normal couples that are filmed by professionals, in which case the only obvious distinction from amateur pornography is the higher quality of production, filming and editing. Rough sex pornography is similar to pornography featuring sadomasochism, and typically features a Top who humiliates and/or degrades a Bottom while being physically violent towards them. Sometimes special furniture is used, such as a queening stool or smotherbox. This style of filming is in contrast to having a separate, third-person camera crew filming all the action. Depictions of male and female masturbation are common in pornography, including gay pornography. Strictly speaking, bondage means binding the partner by tying their appendages together; for example, by the use of handcuffs or by lashing their arms to an object. Transsexual porn star Wendy Williams has stated that transsexual porn is classified as Straight Specialty. The range of its individual characteristics is thereby wide. Adult animation is genre of animation geared towards adults and sometimes teens. Others may also use vibrators and other sexual devices more commonly hentai videos associated with female masturbation. Watersports pornography features sexual activities involving urine, such as golden showers. Softcore gay pornography also exists; it at one time constituted mature milfs the genre, and may be produced as beefcake pornography for heterosexual female and homosexual male consumption. Using the term shemale for a transsexual woman often implies that she is working in the sex trade. Body parts including fingers, tongue and penis may be used for anonymous oral, vaginal and/or anal intercourse. Performers are usually clean-shaven, thinner and more effeminate than ones in mainstream gay pornography. Matsuo used amateur actresses in his videos, and he usually traveled to their hometowns for the filming. Gay-for-pay describes male or female actors, pornographic stars, or sex workers who self-identify as heterosexual but who are hot gay sex paid to act or perform as homosexual professionally.