The function of the vaginal cavity is to basically interact with the penis and it also acts as the birth canal. This is where the child actually moves from the uterus into the vaginal cavity and then out of the body. So the vagina is an elastic muscular tube that connects the uterus to the outside environment. This is where the sperm injures the woman during sexual intercourse. So essentially after sexual intercourse, once the semen actually is ejaculated into the vagina, it travels via the cervix, into the uterus and eventually travels into the fallopian tube. And if it meets with that egg, with that ovum, they fuse to form the zygote and the zygote will move and implant itself onto that endometrium, the lining of our uterus.