Same here I'm afraid - my wife knows I like long hair in general (hers is BSL, thick and soft), and that I like to touch and play with her hair (which I don't get to do as much as I would like to), but she has no idea of the extent of my fetish. When she is blowing me, I like to hold her hair in a ponytail, when I would really love to wrap it around my cock. When we are doing it doggy style, I will sometimes collect her hair and tug on it gently, I won't last very long after that! I do get signs that she also enjoys when I do that (including the times I play with her hair and the BJ ponytail hold), but I've never worked up the courage to totally come out to her on the extent of my hair fetish. The fear that she may be disgusted is a risk I have not been able to take.