It doesn't bring me physical pain, idk if it is like that for everyone but it does bring pain for everyone. It brings emotional pain and embarrassment.i dont know why people do it, i canr even explain why i do, but i think it is the thrill that we crave so bad. Knowing that it is something that is going to bring excitement, when we do it, we dont care about the aftermath, all we want is something exciting to happen even if just for a little bit. There are also people that I know do it because they feel they need punishment for something they feel they did wrong. It is the self loathing that causes that for some people. I dont know of any others, it is very ****ing stupid, but people don't like listening for their own reasons, all you really can do is be there for them and push them on the right path with tlc, something they, as humans, deserve.