You might be lucky and also see young girls from Romania, Ukraine and Russia, but it is quite rare.
It is necessary to add extra fees to take off bra, to touch the body and to change positions.
In France, prostitution as a personal business is legal, but organized prostitution or mediation is illegal.
So there are not large brothels unlike in Spain or Germany.
Rue St-Denis is the territory of young black street walkers, while Rue Blondel is that of white French or European middle ages.
Even though they are middle-aged, some are sexy enough.