The Importance of Coitus

What is coitus or copulation? In simple terms, sexual intercourse is when the male reproductive organ penetrates the female’s vagina to fertilize the egg. This results in a new organism, which is called a fetus. Some vertebrates also lay their eggs externally. This type of intercourse occurs in men and women, but does not occur in all species. However, there is a growing body of research supporting the importance of coitus.