So the best approach looks like being make the first moves oneself and seeing what the reaction is. I've always felt uncomfortable about making the first move with someone who appears to be legit. Have other members been through this uncertainty?
Some years ago I saw an English girl who was advertising on GT. No tell tale signs in the ad like wording or hours worked. If they work late 7 days a week that's usually a good indicator there is more on offer.
She was fully clothed as she started the massage. Not top class, but OK. Got chatting as the massage progressed and told her I usually go to the Thai's and said they don't care where the oil goes! That seemed to break the ice, so to speak. She must have been holding back for an indication from me. To my delight she replied, 'Neither do I.' From that moment things progressed to a nice finale!
So you could try something like that!
Good luck!
..S....