Can't really couple the exist of Cryptocurrency and protection of Women from sexual expoitation, frankly.
I believe those girls doing this kind of trade, especially those who find sugar daddies, are willingly to do that, they are not forced.
Meaning that you cannot "protect" them by removing the ability of gathering lots of money.
Moreover, no centralized money printing power is not equal to lack of money gathering power and individuals.
Look at all the whales here, they are holding huge amount of Steem, SBD, which is not printed centralized by any organization.
They can become a sugar daddy if they want to and if there are demands approach them!