Vagina is the correct answer to this question. Women have vaginas and it is important to their reproductive system. When a woman has a child, it comes from their vagina, through their birthing canal. The vagina is one of the most intriguing parts of the woman's anatomy, because over time, there are so many changes that it goes through. Along with that, the vagina is a self-cleaning body part.
It cleans the inside of itself, which is why it is not recommended to insert soap or douches. The vagina is able to clean and remove any unwanted bacteria on its own.