Simple premise that can be taken almost anywhere.
Superheroines become Hooker’s not due Mind Control or some Supervillain plot, but simply because they want to be!?
First one heroine dose it, then she drags others in with her, then that starts to trickle down to the female supporting casts and then THAT has knock on effects to the entire world...
Stories can include anything you want appropriate to the premise (BE, Bimboisation, tattoos, piercing, extreme hair, slutty clothes, smoking etc, etc) EXCEPT anything that FORCES any of the woman into being a hookers/sluts, they either need to do it to themselves, or enthusiastically embrace the idea beforehand.
These women decide that they want to be complete sluts, and if they can be paid for the privilege? Well that’s just the cherry on top...