Bonus points to the researcher, in announcing findings that intelligent people have better sperm, who said "This does not mean that men who prefer Play-Doh to Plato always have poor sperm: the relationship we found was marginal". I've a feeling that line has been getting a workout before it was picked up on the BBC. Nevertheless, it is clever.
The results themselves are unnerving - I'm not suggesting they're wrong, merely saying that once a 'biological' link is established, suggesting that 'nature' thinks smart people are more worthy of reproducing, it's easy to imagine scary conclusions being drawn.
I really need a tin foil hat to wear when I write this stuff.