Usually, the penis comes to the bottom is touching the outer edge of the cervical opening. During sex, the penis is unable to enter the uterus through the cervical opening, but it may touch the cervical opening. Usually, the average length of a woman’s vagina is about 7 to 12 cm, and it is elastic, especially during sex, when it is more excited, and it can extend a little bit, some of it can be about 3 cm. Therefore, some people may reach the outer edge of the cervix, but not the cervix. Others always feel that the vagina is very long, which is also normal.