The only experiences I've had in Paris are the streetwalkers on Rue Blondel, in the 2nd/3rd arrondissements. Closest Metro is St Denis Sebastopol. If you're lucky you might find a nice looking one, and it helps to be able to speak a bit of French. It's normally 70 or 80 Euros for a covered suck and fuck, and don't expect multiple positions 😳.