Voyeur gay movies or peeping Tom pornography is usually more staged with the subjects aware of the cameras, sometimes openly including this exhibitionist awareness. Scenes of multiple penetration are common in pornography. See Gay-for-pay. Often, slave contracts are set out in writing to record the formal consent of the parties to the power exchange, stating their common vision of the relationship dynamic. But starting with The World Biggest Gangbang , starring Annabel Chong, the pornographic industry began producing a series of films ostensibly setting gangbang records for most consecutive sex acts by one person in a short period. The interaction between tops and bottoms—where physical or mental control of the bottom is surrendered to the top—is sometimes known as power exchange, whether in the context of an encounter or a relationship. For example, the Kama Sutra, in particular, goes into specific detail on how to properly strike hentai porn a partner during sex. Failure to honor a safeword is considered serious misconduct and could even change the sexual consent situation into a crime, depending on the relevant law, since the bottom has explicitly revoked his or her consent to any actions that follow the use of the safeword . Interest in BDSM can range from one-time experimentation to a lifestyle. A glory hole is a hole in a wall, or other partition, often between public lavatory stalls or adult video arcade booths for people to engage in sexual activity or naked celebrities observe the person in the next cubicle while one or both parties masturbate. An orgy is a gathering where guests freely engage in open and unrestrained sexual activity or group sex; and a bunga bunga orgy is an orgy in which participants have sex underwater, such as in milf xxx a swimming pool or a hot tub. Men and women may masturbate until famous people they are close to orgasm, stop for a while to reduce excitement, and then resume masturbating. Kinbaku is a Japanese style of bondage or BDSM which involves tying up the bottom using simple yet visually intricate patterns, gay cock usually with several pieces of thin celebrity porn rope .