Copulation (zoology)

Animal sexual reproductive act in which a male introduces sperm into the female's body

In zoology, copulation is animal sexual behavior in which a male introduces sperm into the female's body, especially directly into the female's reproductive tract. This is an aspect of mating. Many aquatic animals use external fertilization, whereas internal fertilization may have developed from a need to maintain gametes in a liquid medium in the Late Ordovician epoch.

From Wikipedia, under CC BY-SA. More on occurri.