A swimmer walks on a beach in Jumeirah in Dubai in this picture taken September 23, 2008. Sex on the beach or drunken trysts may not raise eyebrows in many cities, but a recent case in Dubai has exposed a growing cultural divide between native Muslims and Western residents seeking fun in the sun. Picture taken September 23. To match feature DUBAI-SEX/ REUTERS/Morteza Nikoubazl (UNITED ARAB EMIRATES)