I believe how a woman likes a man to "work it"' may be an individual thing,however, to me, working it is just that! facelick Not just pumping up and down like he's plunging the toilet
But, actually moving in circular motions, pumping at times...slowly and quickly {alternating...having really great rhythm}Almost like he's dancing
In a very sexy,seductive manner!! 
Think lambada!!Or salsa dancing...yummmmm!!