This is an interesting question. But recently I've had to ask myself this, as my girlfriend is suffering from a disorder at the moment and her hair has gotten a little thinner. I asked myself "would it matter if she had to get a wig"? And the answer is no. It wouldn't matter to me now, and I would be happy to help her get a good toplace, if her condition worsened.

If it was a first date though, and I was a younger guy and more immature, I think it would possibly be an issue. But it's something anyone would be able to get over as long as they learn to love the person first for who they are