I do it once in awhile with my boyfriend, ONLY because he LOVES it. It is probally his favorite way to fuck me. It hurts like hell, but I deal with it. I usually enjoy it more when Im intoxicated!!!
No they wont stick out if you buy the really small thongs. The will peak out when you bend down but thats when you have to cover your ass. I have worn super low cute jeans without my thong showing.