Might depend on how long you are together and how well you know each other.

We have been a couple for a while until I told her about my fetish.

I used to compliment her hair already (not in a sexual context).

Her reaction was surprised that I have such a fetish. Then she laughed and said "well its not feet" and that its okay.

Now she really likes the effect has her hair on me.

huge side effect: mostly i massage her neck while her haid is between my legs. Her hair on my cock and my belly which is great as foreplay for both of us.