im not circumsized either, my girlfriend still likes my penis. And no sex with not hurt more. Well since ur 16 it might cuz it might not have been pulled all the way down yet? Anyways u shouldnt be having sex at ur age. I didnt have sex till 2 month ago with my first gf and im 19 goin to be 20 soon. But incase u get horny and decide to do it, bring condoms with you at all times and use it. Getting a girl pregnant is something funny like the movie "knocked up".

Does it hurt when you pull your foreskin back? If it does, you might want to try stretching it delicately for awhile beforehand. Some men (and I emphasize some) who have pain when they pull back their foreskins experience pain during sex. It's all an individual thing...

Agree with impulser23 .
Anyways u shouldnt be having sex at ur age.