Probably nothing to worry about. Friction, thrusting, hard sex, it happens.
If it still "hurts" in 2-3 days, go see your doctor.
Did you use protection? Have you had sex with this man before? Have you had sex before?
It's not uncommon for the irritation from sex to encourage a yeast infection. Cranberry might be the best home remedy for MINOR genital infections. If it itches, burns, or otherwise hurts (more than just soreness from friction), you should see a doctor (or at least a clinic) for an exam.
Hi Charchar, are your lips swollen as well, if so it could Vulvodynia,(swelling of the vagina) and you can google that.
Ok Vaginal juices are acidic, problems from what you eat.
Try changing often, and only use cotton.
Never sleep in underwear.
Only wash you vagiana in clear water, and no soap.
Eat some good plain yogurt, but try smearing some as well, down below.
Good Luck