I'm wondering what bfl edited.
Anyway, it could be that you've moved into fetish territory. And certainly, there are "weirder" fetishes than hair. Since you find it sexually arousing, it's going to be a problem if your wife doesn't find your interest in it equally arousing for her. Basically, you're asking her to humor you, if she isn't involved in whatever it is you want to do...and if you're mostly interested in her hair, which, when you really think about it, is just an inanimate object, like a shoe.
As for if it's weird, who's to say what's weird? It seems realatively harmless to me.