Hal's expression is of one who doesn't quite believe that weird insistence on something he hasn't actually said anything about and wanting desperately to have the topic dropped and moved on. He does not need to know about Atlantean reproductive biology thank you very much. He also doesn't need to know about his team mates sex life or lack thereof now.

Instead he tries to force a little cheer. "So if you're alone now, that means you're free to do whatever you like, huh?" Being a bachelor is the best, marriage is a ball and chain.