I assume they are listening to and enjoying music. My wife likes music, cares not one bit for any numbers or measurements or tech. What she cares about is hearing something in a well known recording that she never heard before, she cares about things sounding "like they are right there".
But I do appreciate the basic feminist question of, "what about the women?" so let me add just a touch more.
Not the well worn ground of the topic. No, shirt sizes.
If I want a dress shirt, there will be numbers for neck size and sleeve length, and likely 2-3 different cuts (tapered, straight). From the numbers I know how it will fit, no need to try anything on.
A woman's size 12? Darned near meaningless. Might be 10, or 14 in another brand.
So, I would say that one factor is that women are used to numbers NOT telling the story, men are used to numbers telling the story, in many every day life situations. This leads women to looking at sizes as a rough estimate, and what matters is how THIS garment fits THEM, not the size number.
Yeah, not a main factor, not a central one, but I wanted to offer something that likely has not been said in the umpteen other threads. And of course there ARE very quantitative oriented women out there. In my experience, they usually don't call attention to their knowledge. Which leads me to this: the proper question, in my mind, is not where are the women audiophiles. It's why don't women audiophiles participate in the audiophile community beyond very minimal numbers? To answer that, find the few that are public, and read some of the comments they get. Or just guess what those look like at times. "Not worth it" is likely the reason.