How does a Vigina get bigger?
When you're having sex, your vaginal canal can get longer to accommodate penetration. Sexual arousal forces your cervix and uterus to lift up and out of the way, which causes the upper two-thirds of your vagina to lengthen.
What causes small vaginal?
Septate hymen is a septate hymen occurs when the thin membrane of the hymen (a thin membrane that surrounds the opening to the vagina) has a band of extra tissue in the middle that causes two small vaginal openings instead of one. Teens with a septate hymen may have trouble getting a tampon in or out.