Within the peoples male, the penis serves both excretory and reproductive functions
sexual activity, also referred to as coitus, or copulation, reproductive work where the male reproductive organ (in people as well as other higher pets) enters the feminine reproductive tract. In the event that reproductive work is complete, sperm cells are passed through the male human body in to the feminine, along the way fertilizing the feminine egg and developing an organism that is new. In a few vertebrates, such as for instance seafood, eggs are set outside the body and fertilized externally.
3D Research 