Last week it was reported on the BBC that fertility in men has dropped by 47% in 50 years. At that rate we might all be gone in 100 years. Book your holidays early!
Actually, this has the potential to be a very serious point.
I was listening to Radio 4 some time ago, and it was posited that the downturn in men's fertility may be due to nearly 60 years of the birth control pill, leaching into water supplies.