You can be entirely self centred and hammer away like a jack hammer.
However, I find it more rewarding to alternate between the 2... based on the their response.
Some of the girls i've seen, prefer a shallow pounding to begin with (penis tip).., rather than balls deep.
But it doesn't take long until they are loosened up for a hard fucking.
I'd rather not blow my load early on a punt. I slow down, when I feel the urge to cum.
If they ask for it faster, I go so fast... I don't even feel the pleasure.
I think I've faked a fair few orgasms with working girls.
They may have faked them to... but I always get my mileage out of them.