My girlfriend and I have been together for about 6 months, and things are great overall, but when it comes to sex, she's incredibly tight vaginally. Like, it's hard for me to even get in without it hurting her, and we've had to stop a few times. She is a virgin.We've tried some stuff already—I've read that foreplay is key, so we spend at least 20-30 minutes on that to make sure she's really aroused and relaxed. Kissing, touching, oral, the works. We also use plenty of lube, which helps a little, but not enough.Is there a certain amount of foreplay time that's ideal, or other methods we could try?