the questions seem ok to ask, but as for, "does he still have periods?", If he's been on hormones long enough to have facial hair, and has been taking them as long as you've known him or longer, then his menses has probably stopped by now. If not, it should stop ridiculously soon.
You've found the section of the forum for transguys who might have some insight. For people who may know what you're going thru, the Loved Ones http://http://www.crossdressers.com/...splay.php?f=66 section of this forum may be of more help.
it's really a good thing that you stuck with him/didn't make him feel like a freak when he came out to you. He was probably nervous as hell when he told you, and accepting him probably boosted his self esteem and confidence a lot.
also, good for you for actually bothering to research this after he came out to you. It shows you really care about him to learn what he might be going thru. But no one leads the same life. He himself is the best teacher for what you want to learn. So don't ba afraid to ask him questions in private about this. I'm sure he knows that you wont be asking to mock him or treat him like an oddity, and that you just don't want to be in the dark about him.
if he's ok with the jokes, keep 'em coming. I'm sure you two wont want to be walking on eggshells around each other, or for your whole relationship to revolve around this one issue.
good luck with your boy.
