If it is not fertilized by sperm before it reaches the uterus it breaks down and is washed out of the vagina through menstruation along with blood and other fluids. When an egg comes along that hasn't been fertilized this inner lining breaks down and sheds and exits by way of the vagina. If the uterus receives a fertilized egg, the egg implants itself in the lining and continues developing there until birth, nurtured by the mother through the placenta that develops. The tubes are ductsto carry the eggs from the ovaries, even though they are not directly attached to them. It is usually broken from sexual penetration, but sometimes exercise can break it.
Hair begins to grow here at the time of puberty.
The clitoris is extremely sensitive to stimulation, and once stimulated it becomes erect. Direct stimulation of the tip of the clitoris is pleasureable for some women and painful for others. They are covered by hair since they cover the urinary and vaginal opening. Once sexually aroused erecile tissue on both sides of the vagina become filled with blood, then the whole area becomes moist with vaginal secretions. They extend from just above the clit to below the vaginal opening.