By looking up the individual providers name
But they have a high turn over of providers and Very high fees to support the lavish home and lifestyle of their "guru" (i've be been to his place).

I think you would be well advised to find an indy tantra provider with refs via here at TER .. who knows if the reviews on TOA site were written by Mr. London himself as there is no way to verify them.
There are ladies here with much more affordable rates who have been practicing for years

She is amazing and has been reviewed.  Generally price is high but for her it is worth it.