<p>I looked into it a long time ago and I think that it’s due to hormonal differences. Male hormones cause slightly darker hair and skin which causes people to perceive lighter features as feminine. Just like smaller features are.</p>
<p>This doesn’t mean that the ultra feminine is preferred on average, though. For example, in the USA, dark hair is preferred in both males and females, on average.</p>
<p>I don’t mind tans, but I HATE them on blonde chicks. Not an appealing contrast, IMO. Overall I just prefer fair skin.</p>