Hi I am 17 years old and fully sexually active male. All of a sudden I seem to have brown semen and constipation. Iv been reading around on the internet and there seems to be several different things it could be. I had un protected sex a week ago with someone and then protected sex with someone else 5 days ago and my semen was fine then. I have been considerable dehydrated the last few days so I don't know if that has anything to do with it?. I masturbated 2 days ago and today and both times my semen was brown and very watery. It was only today I have experienced constipation. Hope someone can help!!!