I can't stand full knickers, I hate the look of them under pants too, I hate when you can see the knicker line, and it's half way up some butt, Gross. It also makes non-wanted bulges.
Thongs are great. I'm all for them. I think they look sexy too, and also, when you are wearing pants and you can see you are wearing a thong, it looks good.
Guys look funny in thongs (we so do not call them thongs here, G-String) I don't like seeing a man in a thong, no matter how gorgeous he is, I hate jocks too.