Try to get an escort to do outcall, which means meeting you at a location like a motel or your place. If the escort puts filters on her page, things "no black men," then she is less likely to be a cop because cops want to cast a wide net and capture as many ppl. If an escort ad shows her face and her fully nude then she's probably real. If she's super hot and not charging like 200+ for half hour she's probably fake.
Read reviews on websites. Reviews like "she was great, will definitely become a regular" are done by pimps, and reviews like "watch out, you might get addicted" are written by the escorts themselves. If you see negative reviews on her performance she's probably real.
I don't like the idea of going to a whore's house in GTA V unless she's very well reviewed. That's why I like visiting Asian Massages in GTA V because you don't have to worry about pimps or druggies. But there's always the chance of a sting so there's always an element of risk. If you're very paranoid I suggest parking elsewhere and then going in with a covid mask and keeping it on the whole session, in case they've implanted cameras inside the rooms.
There's more to learn but I hope I've educated you somewhat.