I know at least in Canada, knowingly having unprotected sex while you know you're HIV positive is definitely a crime. In fact, there are people who went to jail for it. Actually, look up the name Trevis Smith. He's an ex CFL pro football player who did just that. Thankfully, the girl didn't end up getting HIV, but he still went to jail.

And don't forget, HIV isn't the only STD out there. Syphillis is making a big comeback and you can get it from oral sex as well as regular, so ALWAYS use a condom!