Would be fathers often ask if there is anything they can do to get their sperm into tip-top condition. Here, top sperm-expert Allan Pacey, Professor of Andrology at the University of Sheffield, gives his top ten suggestions.

Have you ever wondered why men need to produce so many sperm? To understand why, we need to take a closer look at the journey sperm have to make inside a woman’s body and the many pitfalls and hazards they will encounter along the way.