Thongs are almost all I wear. I used to wear mainly boy shorts/bikinis when I was younger, but I started wearing thongs to avoid panty lines. They are the most comfortable kind of underwear EVER. It feels like I'm not wearing anything. If it feels like "dental floss" it's too small and you need to move up a size. Also, I've never had a yeast infection. You're more likely to get a yeast infection from wearing damp bathing suits etc.
Women realized thongs weren't comfortable and they actually increase you risk of getting yeast infections. Cotton undies are the way to go, they allow you to breath down there. I only wear a thong if my pantyline will show in a certain outfit.
Thongs are uncomfortable to wear - don't understand why women wear them in the first place !