Hux comes from a culture where women wear their hair in specific styles to indicate their eligible or romantic status--certain patterns mean "married to my career" or "pursuing someone specific but haven't gotten there yet" or "anyone can ask me out please" or "i have all the husbands i can support" or whatever. Once a woman hits puberty, it's considered indecent for her to go out with her hair loose, and the most intimate thing you can do with someone is let them play with your unbound hair. There are whole ballads about it.

Hux has always worn the "married to my career" style, until Kylo Ren shows up. But Kylo Ren has no idea what Hux's changing hairstyles might indicate or what her own tangled, loose locks do to the General...