This is how the female human body uses obstacles to block weak sperm, like salmon running into a waterfall | South China Morning Post
What happens to unused sperm/semen in the testes? If it's reabsorbed into the body, how, and does this have a particular effect on health? - Quora
![Scientists discover single sperm can have big impact on a woman (they don't say!) | London Evening Standard | Evening Standard Scientists discover single sperm can have big impact on a woman (they don't say!) | London Evening Standard | Evening Standard](https://static.standard.co.uk/s3fs-public/thumbnails/image/2012/01/03/09/with_sheet_415.jpg?width=1200)