Do teenagers have genetically weak sperm?

A new study by scientists at the University of Cambridge claims teenage sperm is genetically weak, but is the claim credible?

Teenage boys already have plenty to worry about: spots, girls and the size of their "thing", as Adrian Mole might have put it. Does the problem of having genetically weak adolescent sperm really need to be added to this list?

Scientists at the University of Cambridge have suggested this is the case after carrying out a study involving more than 24,000 parents and their children. The analysis focused on tiny genetic differences between parents and offspring, which are assumed to be caused by copying errors in the egg or sperm cells.