That's coz the burds are dating
They know the score - blokes in general don't like hairy muffs
Presuming they like RO they're far more likely to get this when shaved or heavily trimmed
And they want to be able to pull blokes rather than be left on the shelf
Contrast this with a boring sexless OH. You'll need a garden strimmer. If you ever have the opportunity to wistfully get it out of the garden shed. Only to put it away again the next day, not even firing it up
I dated a couple of years ago and they were all shaved, or heavily trimmed. These were not young women either, thank you internet.