There are 2 types of totally fake reviews
  1. Those by people who never visited the escort
  2. Those by the escort themselves


This suggestion will get rid of type 1

  1. When each escort registers with EI give them 1,000 review coupons
  2. The review coupons are essentially just an 8 digit number
  3. The escort then gives one of these to any client who asks
  4. The only way you can enter a review for say escort X is to use a valid review coupon number
  5. Each review coupon number may only be used once


Then we would all at least be sure that reviews for an escort came from people who had access to their review coupon numbers
(and yes they might still ask friends to use them for false reviews)

Thus this would get rid of all type 1 review fraud