Is it common for providers to allow their clients to massage them?  I'm curious, because I enjoy doing this and I feel it allows me to express my caring attitude to the provider.

Yes, most don't mind the customer making them feel good. eom

The best providers will allow you to massage them as part of the overall fantasy.  They would have done pre-work to get some assurance that you are safe ahead of time.  Look at the profile of the provider that you plan to see to determine what her massage quality is like.  The ones that have a good or awesome rating would be good choices.  Sometimes it is better to receive than to give, and good giving ladies probaly get off on being on the receiving end sometimes if that is the guy's desire.

In fact when I used to go to massage places here in Boston, I would end up massaging the woman just as much as she massaged me.  I always got compliments from my service, and many of them appreciated it because they were working real hard all day, and needed the rest.  In fact one of them I used to see always made sure I saw her, because she appreciated it.

When I have massaged many of the women I have seen, they have always appreciated it.

I've had the same experiences at massage places.  Sometimes you can get a cutie with a better attitude because she know she is getting a massage when you get back to the room...I've seen girls light up when I go in, happy to see me, and it's not my appearance that's getting them happy.  

Sometimes I have been requested to give her a massage "Now it's my turn, you massage me"  Especially when I have seen the same girl a couple of times.

It wastes time and makes for less work for them!