Might St Paul be talking about the fact that women take care of fheir hair and do things with it to make it more beautiful? That seems to me to be the nature part: that it is a woman’s nature to do things wjth her hair.
OTOH, men ought not to fuss wjth their hair–they should keep it short. Why? Possibly because it is in men’s nature to fight, for example, if a man and a woman are tgether and they are attacked, the natural thing is for the man to fight and the woman to be protected. So men do 't really have the luxury, because of their nature, to have long hair because an enemy can grab it in a fight.
Plus, most people would think that a man who is even only half as fussy about his hair as the average woman is a bit woman-ish, no?
So I don’t think it is the length of hair per se that St Paul is talking about, but the fact that a woman’s hair adds to her beauty and when men have long hair, it takes away from their maculinity.
Consider what was said to those long-haired hippie men in the 1960s
This may have been a sort of real-life example he was using to convey some idea rather than a “rule” in and of itself. Women should hang back more in church than men–why? Because it is men’s nature to act and not to reflect, reflection needs more development in men because it doesn’t come as naturally to them. When I consider how the men have disappeared from our churches since we started treating men and women more the same, it makes me think maybe St Paul had a point there!
I want to mention that St Paul does not seem to have said long flowing locks, just long hair for women as opposed to short hair for men. Older women often have a lot of trouble with maintaining any sort of length to their hair, and there are women who go bald as well as men. This is why I think that he was, in a way, not really talking about hair lenth as the measure of beauty or feminity, but using it as an example for something more internal.