Over the summer, my girlfriend lost her virginity to me. We go to school kind of far away, so we only get to see eachother every 3 or 4 weeks for a few days. Whenever we have sex, she says it hurts when I initially penetrate her, but after that it's not a problem. Now it's gotten to the point where she seems to be completely avoiding having sex even though she says it doesn't hurt after she's penetrated. This weekend, I saw her for the first time in 7 weeks, and she put off having sex until the last night we were together. No matter what I did (oral, rubbing her clit, all combined with plenty of kissing and touching), I couldn't get her wet, so sex was impossible. I always go through all this to make sure she's aroused enough if I need to, and she still says it initially hurts to have intercourse.

Even though she won't admit it, am I correct in assuming that even though she says she wants to have sex, her lack of getting wet is her still being uncomfortable with the idea of pain? Also, is the initial pain from not being aroused enough? As in, should I invest in some good lube? Or could it just have to do with the fact that we're not having sex very often (a month at best until breaks from college)? Or do I just need to talk to her to get her to relax more? At this point, I don't really know what to say or do for her. I've asked her if there's anything in particular she likes, but being new to sex, she's either too shy to admit to anything or she just doesn't know yet.