The U.S. maybe, simply because we are inundated with it. Americans are obsessed with breasts, all you have to do is look through all the questions in Yahoo Answers and see this. In Europe they are swamped with it but it's different. You see topless women on the beaches, and public pools, in TV commercial, on variety shows, daily soap operas, etc. So they don't think anything of skin like people in the U.S. do. Playboy hasn't sold and issue in Europe in 30 years because of that fact.