Although interracial pornography theoretically can apply to depictions of sexual activity between performers of any different racial groups, the term is most commonly used for heterosexual sex acts between black and white performers. This stop and go build-up, known as edging, can achieve even stronger orgasms. The term applies to the depiction of the act 3d hentai rather than the act itself, and so does not include live exhibitions like sex shows and striptease. Types of anal sex can also be a part of lesbian sexual practices. Many cultures describe pain as an aphrodisiac. Most soft crush fetishists avoid being placed under the same label as hard crush fetishists, believing that crush films with larger animals give the entire group a bad label. 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. For legal reasons, the vast majority of young gay porn so-called reality porn involves professional actors and actresses posing as so-called amateurs. Urolagnia is a form of salirophilia in which sexual excitement is associated with the sight or thought of urine or urination. The arousal from being desperate comes from the sensation of having a full bladder. Other objects such as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection. This may help them develop their orgasm, increase its pleasure, and may inspire them to masturbate on a more frequent basis. Group sex most commonly takes place in a private sex party or semi-public swinger gathering, but may also take place at massage parlors or brothels or, in some jurisdictions, at purpose-built locations such as sex clubs. Use of the agreed safeword is seen by some as an explicit milf fuck withdrawal of consent. The work of Bruce Seven has been called reality porn, due to his lack of using scripts and asking his performers to act naturally in their own character. Such explicit sexual interaction is seen only rarely in public play spaces, and it is sometimes specifically banned by the rules of a party or playspace.