Ehhh... Kinda sexist, in a weird way? I give it a 6/10
I feel like if you do 'reversed chastity', you've got to be clever about it.
You can't just make women promiscuous and men fainting violets and call it a day.
You also need to change which gender has make-up and provocative clothing, just for starters.
What drives chastity is the negative consequences of sex - if sex was actually a great things for both parties, chastity wouldn't be reversed, it'd be absent entirely. The rare 'Chad' mutation would have a hundred babies each, and the entire next generation of men would be as eager for sex as the women.
The challenge to the author is to make up a reason that this doesn't happen; find some negative consequences for men.
Maybe they use spells to find the father of a baby and force him to raise the baby alone. Maybe the STI:s of this world are three times as deadly for males. Maybe virgin men turn into wizards at 30, so they have a reason to want to wait.
Frankly, the MC should be classified as "used goods" and shunned by now.
Plus he should've picked up a venereal disease or two.
And he should have a couple of kids who he is forced to feed and clothe.
As for women, having a baby is risky, uncomfortable, and expensive, which is why women prefer a long-time partner.
In this genre, you want to eliminate those negative consequences.
So... maybe there's easy spells for abortion, or there's artificial wombs. Maybe the state by default takes all babies to raise in public orphanages,
An interesting thought is that the 'normal' version of the MC would just be a garden-variety succubus who's also the protagonist in a fantasy story.
And I can't really recall any work where the MC is a succubus who has tons of sex, is unashamed about it, and has a regular fantasy story outside of that. (Closest thing might be Dabbler from Grrlpower, and she's a side character.)
If you gender-reversed this comic, keeping everything else the same, it would actually kinda be more innovative than it currently is.
Every man pretty with great hairstyles, every woman other than the protagonist a schlub with boring clothes. It's like the horizontal flip for drawing, but for gender; it tells you what is wrong with this picture...
I wonder how long it takes before AI can just do that for you...
