Humans breed via internal copulation, commonly called sexual intercourse or sex. GUWS Medical notes that internal copulation is an act in which the male reproductive organ enters the female reproductive tract to deliver the male gametes to the female gametes.
Humans are mammals; in order for a human to breed, an egg, or ova, provided by the female must be fertilized by the sperm from a male. As is the case with most mammals, male inserts his penis into the female's vagina, where he ejaculates, releasing sperm into her reproductive tract, states GUWS Medical. The sperm then makes its way to the ova, where the first sperm to successfully penetrate it fertilizes the egg. The female continues to carry the resulting fetus as it develops throughout the gestation period until it is fully developed.