I spent a fair bit of my youth where there's been legalised brothels (or at least I assume they were through most of my childhood) and sex work. And on the other hand there's also physiotherapists and actual massages. I don't particularly like massages that much, personally, but if needing one I go in and tap my health card and that helps cover it.

So presumably there was no need to hide the business behind the euphemism/front, everyone just knew that if you wanted sex/porn, you went to a brothel in suburb X. Even where I am now, i know there's brothels and presumably private sex workers and if i want a massage I go and I book a massage.