Insertion in pornography features women inserting various odd objects into their anus or vaginas. The term discipline describes psychological restraining, with the use of rules and punishment to control overt behavior. The rise of the Internet in the late 1990s and early 2000s similarly changed the way pornography film was distributed and furthermore complicated the censorship regimes around the world and the legal prosecution of obscenity. Bisexual DVDs sell much better online than in adult video stores, possibly due to customers in stores feeling embarrassed to buy them. 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. While bondage is a very popular variation within the larger porn milf field of BDSM, it is nevertheless sometimes differentiated from the rest of this field. This hentai sex technique may include gay sex video the use of a simulacrum, or artificial vagina. The higher pay scale and profile within a production often leads to group scenes where a straight actor only tops. There may be more than two participants; both group sex and gang banging can be included. Teacher and Student or Boss and Secretary pornography involves sexualized situations which take place between an authority figure, such as a teacher or boss, and an underling, such as a student or secretary, often fake. Pornographic films present sexual fantasies and usually include erotically stimulating material such as nudity. Sadomasochism does not imply enjoyment through causing or receiving pain in other situations . Performers are usually clean-shaven, thinner and more effeminate than ones in mainstream gay pornography. Real enema shots or videos of true medical situations may violate privacy laws in some countries. By Japanese law, the genitals of actors and actresses must be censored and up the mid-1990 so was the depiction of pubic hair. People may engage in anilingus for its own sake, before anal fingering or penetration, or as part of foreplay.