The world's largest sperm bank is turning away potential donors who have red hair.
Cryos International's director told a Danish newspaper it's a matter of supply and demand.
He says red-heads' sperm's highest demand comes from Ireland.
But most customers want sperm from brown-eyed, brown-haired donors.
For now, the bank doesn't need any sperm.
Cryos' director says it's at capacity and has a waiting list that's 600 names long.
That's why it says it's being more selective about what donations it accepts.