If I date a woman, how do I tell her to leave her hair long?

If I date a woman, how do I tell her to leave her hair long?
Like for me, I love Natalie Portman with long hair. If she was my wife/girlfriend, I’d demand her to leave her hair that long and never to cut it. I’d have more desire to kiss her.

I don’t want to hear stupid or gay answers like: It’s her hair not yours, love her only on the inside, looks don’t matter, etc.

I’m definitely a heterosexual male. For a woman to attract me, she has to be pretty, no exceptions. Either she looks physically attractive to me or I don’t want her.

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Going back with Natalie Portman. With how her long hair looks in the picture and she has a pretty face, I’d love to run my fingers through her hair, play with her hair and kiss her hair, head, and face while having my arms around her.
If I date a woman, how do I tell her to leave her hair long?
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