Reproduction is the process by which organisms make more organisms like themselves. But even though the reproductive system is essential to keeping a species alive, unlike other body systems, it's not essential to keeping an individual alive. In the human reproductive process, two kinds of sex cells, or gametes GAH-meetz , are involved. The male gamete, or sperm, and the female gamete, the egg or ovum, meet in the female's reproductive system. When sperm fertilizes meets an egg, this fertilized egg is called a zygote pronounced: ZYE-goat. The zygote goes through a process of becoming an embryo and developing into a fetus. The male reproductive system and the female reproductive system both are needed for reproduction.

Collectively, these parts are called the vulva. Rich with nerves, the vulva can provide sexual pleasure when properly stimulated. The vagina is a muscular tube about three to four inches long that ends the birth canal. The vaginal opening is visible from the outside but it is protected by the labia when a woman stands and during most activities.

When a child's gender is not clear at birth, the child has atypical genitalia ambiguous genitalia. This means that the genitals don't seem to be clearly male or female. You have 46 chromosomes in each cell of your body. These are grouped into 23 pairs.