My girlfriend, whom I love very much, is very very tight. She isn't a virgin, I took that gift from her long ago. She is, however, very tight, and now every time we try to have sex, I can barely even get the head in before she tells me to pull out from pain. I want to take it slowly with her, because I know it will be much better that way. Can I get some tips from guys who've done it and/or girls who've had it done? What can I do to make her more comfortable, relaxed, and wanting?