Nothing, but there's a load of cultural baggage applied to it that this study has managed to largely ignore. Preferring to make grand sounding and completely unsubstantiated comments about Open Savannah, Evolution and Ripe fruit. That's what I object to, it's just bad science. The sample group is too small and it appears to be confined to a group that right or wrong has colour/gender preconceptions. Now if you can replicate the results with an international multi cultural survey covering thousands of individuals then you'd have some credibility. At best all its managed to do is confirm that a higher proportion of girls prefer Pink, which we knew. To come up with all the so called "explanations" is poor and barely rates as a hypothesis, let alone a theory.