This is a community for men who wear thongs (or other skimpy underthings) as underwear, or swimwear, or people who have an interest in such. The common conception of people in society is that men who wear such things are gay or feminine or something similar, and there's many of us out there (myself included) who are straight thong wearers.
If you ask the majority of women out there why _they_ do it, it's probably a response about comfort. I, along with many others, have also realized that sometimes a butt just needs to be free. It doesn't necessarily have to do with the person being an exhibitionist, a creep, or anything like that, although sometimes that can be a factor.