Most "asexuals" I've met (and I have, for my sins, met a lot) seem to fall into three categories:
1. People who are either young (teens) or older but very immature, and their sex drive hasn't kicked in yet / they're socially anxious enough that the anxiety overrides .
2. People with medical and/or trauma issues related to sex, that started before their sex drive kicked in (e.g. vaginisimus/other "painful sex" issues, childhood sexual abuse, hormone imbalance, body image disorders).
3. People who buy into the "asexuals can love to fuck, they're just not sexually attracted to anyone" (whatever the fuck that means, idk how that's substantially different from wanting to fuck, but there you go) and have decided they're gonna be special for tumblr brownie points.
I know sex researchers do recognise "true asexuality", i.e. people who seem perfectly physically healthy and mentally well-balanced, who just have zero interest in sex (and generally romantic relationships). Even Kinsey of the Kinsey Scale fame identified them, as a group with "no socio-sexual contacts", so science has known about them for a while. But these people are vanishingly rare, I suspect, and probably make up a minority even of people who claim they're asexual.
All this to say that Womb Wizard is almost certainly a type 3, and our very own Mistress Penny is probably a type 2.