Britain's fertility experts are calling for an overhaul of sperm donation services to meet the now critical shortage.
"The British Fertility Society (BFS) said the removal of anonymity for donors in 2005 might have led to the lack of volunteers, leaving Britain struggling to meet the demand for donated sperm.
Some 400 patients need donor sperm every year and many clinics have long waiting lists or have been forced to stop providing services at all.
Writing in the British Medical Journal, Mark Hamilton and Allan Pacey from the BFS suggested that more families could be created from a single donor.
"The authors also suggested a shake-up in the recruitment services to increase the number of donors."
(I tried to think of a photo for this piece and I just really really wanted to go there. And decided not to.)