As soon as a girl gets excited the vagina lengthens and becomes wider. The uterus and cervix are pulled upward, taking the vagina with them. The lips of the vulva flatten and move apart, while the vagina expands like a tent. It is thought to allow for easier passage of the sperm into the uterus and fallopian tubes.
During orgasm not only the love muscles contract, but also the muscle that surrounds the uterus. Some girls really like the sensation, while others barely notice it or don’t feel anything special.
After orgasm it can take 5 to 10 minutes before the uterus has regained its normal position.