We're experiencing a shortage of sperm. Not apocalyptic 'Children of Men' style, but in a rather hilarious fashion. The British government even put out ads on the radio asking for men to wank for the national sperm bank. Of course some lucky bastards are benefiting from this, but I have to admit, I doubt I could keep a straight face if I said I made my fortune out of running an international semen shipping company.
I read about this. Another issue facing British sperm banks is that British clients tend to demand donors who are 6' tall (and doctors or barristers, of course) when their men on average are around 5'8" (I think) and usually not doctors or barristers.