Give Me Your Sex: HIV + Sex

Anonymous question this week:

I have a friend who is HIV+.  He doesn’t disclose his status to prospective partners, and I know he’s having unprotected sex.  What’s my obligation here, or do I even have one?

And here is the response after the jump.

As always, please leave your questions and comments below. If I didn’t get to your question this week, I will get to it next week!