Some restrict a policy of panties/nipple tape for females and some allow full nudity with explicit sexual interaction allowed. The current record is held by Lisa Sparks who had sex with 919 men on October 16, 2004 in Warsaw, Poland as part of the Third Annual World Gangbang Championship and Eroticon 2004. It may be used as foreplay, or as an alternative to sexual penetration. A pearl necklace is a slang term referring to a sexual act in which a man ejaculates semen on or near the neck, chest, or breast of another person. 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. It spawned numerous sequels, several of which won adult film awards. Enema pornography involves adults given enemas to others, often fake. 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. Fisting pornography features the insertion of an entire hand into a performer vagina or anus. This category also includes pornographic home movies. Male masturbation may differ between males who have been circumcised and those who have gay movies not. Although pornography has usually focused on heterosexuality, due to the prevalence of the heterosexual orientation, explicit gay material has a long history as well, which reaches back to Greek antiquity, if not to prehistory. Bisexual DVDs sell much better online than in adult video stores, possibly due to customers in stores feeling embarrassed to buy them. The padding may also muffle noises from the outside, causing a relaxation effect and heightening their other senses. Well-known female porn stars who expressed their pleasure in pegging their male partners include Taylor Wane, Debi Diamond, Brittany Andrews, and Monique Covét. Squirt pornography involves women ejaculating. Saliva pornography involves lesbian hentai salivation and saliva. Japanese rope bondage is distinguished by its use of specific katas and aesthetic naked milf rules.