Bit of a strange post, duo's happen all the time without any problems.
I'll take your word for it.
When I used to punt more often a few year ago - I may be remembering it wrong, but - I thought incall duos became a bit of a grey area ??
Clients ?? that's the term prossie's use. 
Punters and clients are one in the same. As are escorts and 'prossies' (as you wish to call them).
Your last line's a bit cheeky in my opinion, a bloke with no reviews telling a punter to 'be sure' to post one.
Whilst I've been in the industry 10yrs, I've only had an handful max of bookings/appointments/punts in the past 4-5yrs... and only signed up within past week or so, so apologies for not yet leaving a review.
However, in the past I always left feedback and reviews to help my fellow clients (sorry: punters) with their choices (even used to put the ladies names of those I'd seen in my Signature... I dunno, it seemed to be the done thing on that forum at the time).
Hence my comment, cos if I used the resources then I believe in paying back & showing my respect to those who helped me by leaving a review.
Which I will do, when I make another booking.
