Semen The way it looks and its nature What it is made up of
 Seminal plasma protects and provides food for sperm as they travel inside a woman's body. The inside of a woman'a vagina does not suit sperm cells as it is acidic. To protect the sperm from the acid, seminal plasma is alkaline. Seminal plasma has chemicals called prostaglandins in it to stop the woman's body from killing the sperm.