Only when leaving an appt a bit over time and see the obvious next appt, lol.
We all have different circumstances and reasons for mongering, so basically impossible to tell just by looking.
It's more fun trying to spot a provider, as they are generally not as good looking without makeup, but still have that swagger. Esp around the apt complexes after work, there are a lot of butter-faces with exceptional bodies, so it's fun to ponder the possibilities.