Thanks rosabud. I agree - the fact that folks are thinking about whether they might be harshly judged for not shaving in itself does show just how normalised the practice has become, how if you don't do it and would never consider doing it, it still niggles in the back of the mind.
Greenhill, I'm trying, but I'm not "getting" your pitch for this just being a choice, and actually a positive choice for women. For starters, it IS a gendered issue. Waxing and shaving of male genitals hasn't become as mainstream as that for women, and you'd never hear either men or women describing men who didn't shave or wax as dirty, disgusting or repulsive. Women who don't DO get this. I work with young girls who haven't even started growing pubic hair, but already they are picking up that their genitals will be considered ugly or shameful (and by extension they will be) if they don't wax or shave. That makes me feel deeply sad every time I hear it (along with usually a whole litany of things they have to change about their bodies in order to be acceptable by their peers, let alone every stand the chance of getting a boyfriend.)
One might also argue that women are under more pressure than men to cover their grey hair, so that is also a gendered expectation. Surely you recognise that women get far more criticism for their appearance if they look natural than men do - the old, "she's letting herself go," comments.
I get that you are saying that women you know don't shave or trim because they feel dirty or shameful or they hate their own bodies. However, I hear many women say they do it because they believe it is/feel's cleaner (implying if they don't, it's dirty.) In popular culture, we see women celebrities ripped to shreds for having a bit of body hair exposed (e.g. Julia Roberts, Pixie Lott) and nasty comments about women who don't shave or wax are pretty common parlance. Imo, it's not that they feel ashamed of having pubic hair or hate their bodies, but they don't want to be subjected to nasty pronouncements about their hygiene, appearance or level of femininity, so they conform.