Accidental anal intercourse: does it really happen?

Centers for Disease Control and Prevention (CDC). Available from: http://www.cdc.gov/EpiInfo Johnson, 2001, Sexual behaviour in Britain: partnerships, practices, and HIV risk behaviours, Lancet, 358, 1835, 10.1016/S0140-6736(01)06883-0 Evans, 1988, Sexual behaviour in women attending a genitourinary medicine clinic, Genitourin Med, 64, 43 Sangwan, 1998, Internal anal sphincter, advances and insights, Dis Colon Rectum, 41, 1297, 10.1007/BF02258232 Rasmussen, 1994, Anorectal function, Dis Colon Rectum, 37, 386, 10.1007/BF02053604 Read, 1991, Reflex anal dilatation: effect of parting the buttocks on anal function in normal subjects and patients with anorectal and spinal disease, Gut, 32, 670, 10.1136/gut.32.6.670 Masters, 1966 Shafik, 1999, Physioanatomic entirety of external anal sphincter with Bulbocavernous muscle, Arch Andrology, 42, 45, 10.1080/014850199263048 Carballo-Diéguez, 2000, Frequent use of lubricants for anal sex among men who have sex with men: the HIV prevention potential of a microbicidal gel, Am J Public Health, 90, 1117, 10.2105/AJPH.90.7.1117