In cancun I wanted to go nude but could only go as far as you all did. Wish I woulh have had the floss that you're talking about. I alternated between a thong (that left a triangle tan line above my butt crack) and a brazillian style monokini that covered more of my butt but was low enough on my hipps that the thong triangle was visable to get sun. By the end of the week the only part not tanned was a small traingle that would have been covered with hair if I didn't shave.
I also use the word tits in regular converstation, of course I have lots of guy friends who talk to me like I'm one of the guys so I hear lots of "crude" language from them. I think here we use boobs or breasts because tits have the conotation of a bunch of frat boys at mardi gras chanting "show your tits" and the like.