Vaginal dilators really do work to increase vaginal caliber--the size of the opening. If you're having your first sexual encounters, have an exam by your healthcare provider to rule out other causes: there may be an issue with the hymen, for example, that would have a different solution.
But for women who've been sexually active, dilators can make a world of difference. I had an e-mail a couple of weeks ago from a woman who hadn't been able to have intercourse for two years. After using vaginal dilators for a month, she was able to have pain-free sex!
Dilators come in graduated sizes; the smallest is only a half-inch in diameter. They are used with a lubricant daily. When you're comfortable with one size, you progress to the next-larger dilator until you've achieved the caliber--the opening size--that works for you and your partner.