Sex at 16 IS something to worry about! Sweetheart, please say you are on the pill and that you use condoms, at least. It scares me to death that people so young might become parents, or get incurable diseases, simply because they dont know better. I know I'm not your mom, and I would much rather be the one who helped you by saying the right thing. Please stop having sex right now. You are too young for that kind of responsibility. You can have fun and bonding experiences with your bf without sex. :) - Blu
Your clitoris does become swollen during sex, that happens when a woman is aroused, and generally goes back to normal a while after. If it continues to be swollen then that could be because you or him was being too rough with it or something. Wouldn't seem like anything to worry about to me.