http://www.gonomad.com/features/0505/american_nudist.html

Doubt if you can access that link from Qatar. Its an article by a reporter who sampled the nudist life at a "clothing optional" resort.

excerpts-

"There are more than 44,000 dues-paying members of the American Association for Nude Recreation, (AANR), the lobbying group based in Kissimee Florida. Thousands more enjoy nudity at home or skinnydipping at a local nude swimming hole. But the people who vacation every weekend at De Anza and at the more than 100 other naturist clubs across the U.S. regard taking it all off much more seriously.

One women at the resort said that the first thing she does when she gets home from work is take off her bra. Nudists keep on going, and prefer to get naked as soon as they shut the door to the outside world."....

"Americans equate nudity with sex, and that simply is not the case. Sex with strangers isn’t a part of nudist resorts, though of course, you can find this at other “alternative adult’ resorts that are a universe away from a place like De Anza Springs."