Freeze young men's sperm to avoid genetic disorders, says scientist

Bioethicist says older men's seminal fluid contains greater number of mutations that could pose a risk to future offspring

Younger men should consider freezing their sperm to avoid their children having genetic disorders if they choose to have them later in life, according to a bioethics expert.

Freezing eggs from women planning families when they are older is not unusual, but bioethicist Kevin Smith, of the School of Science, Engineering and Technology at Abertay University in Dundee, believes freezing should also be considered for sperm to avoid the risk of "gradually reducing human fitness in the long term".