Sperm donated after death could help with a shortage, say scientists.
Donors have an undetectable viral load, meaning the virus cannot be passed on to their children.
Under the sheets, there's more going on than meets the eye.
Men have more of a 'biological clock' than previously thought.
It could mean couples need fewer cycles of IVF before conceiving.
But men shouldn't up their caffeine intake just yet.
The relationship between sperm count and fertility is actually pretty weak.
One in six couples have fertility problems in the UK.
'I am very worried about what will happen in the future.'