I was at my friend's house one time and she left a pair of her jeans on the floor in her bedroom. I totally HAD to look at the size. Then, I Googled how much a person would weigh with that pant size (much, much larger than mine, so I had no basis of comparison). I felt so weird. Then, my sneaky way is to ask (of my closer friends, of course) bra size. I feel like that's a more normal thing to talk about rather than waist/hip/BMI/body fat percentage, at least among girls. I find it very telling... GAH! It makes me feel creepy!!