Hello.
I was wondering if anyone could answer my question?
I have been to massage parlors twice, once full service and once 'Happy Ending' only.  Both times the ladies looked at me before they got on with their business, as it were, and put their fingers to their lips in a 'Be quiet' gesture.  I was wondering if this is commonplace in all massage parlors?  
If so, why?  
Thank you so much in advance for your answers, everyone!

1) Do not tell anybody else what we are doing here.   This is so that you do not go a blab to everybody how someone named xxx gave you full service or a Happy Ending at this particular place.   They do not need to advertising, and most certainly do not want anybody else to be "advertising" it for them.

2) Or perhaps they wanted you to remain quiet in the room.  Some people when they are orgasming are quite loud, and the walls in those places are not soundproof.

Whichever one it is, both are great advice...

I have only been to an AMP once...  and this happened.  I believe it was because of the thin walls.  
skb