I don't think it matters. I know the most conservative looking people who have the kinkiest sex lives! I also know some people with outrageous hair that are pretty vanilla in the boudoir.
I don't think there is a correlation. But, a poll of posters may at least give a small sample so we can see, at least in the Eden community. However, we are a self selected group, and probably tend to be more kinky than the norm, so I don't know if it would make a difference, even here.
My hair is dyed Black. Just either "Blackest Black" or Blue Black. Not all that unusual. It looks good on me, and I don't think it has anything to do with my sexual proclivities.