Doc,

With all due respect, how can one measure his stroke rate when both hands are tied up caressing the lady's boobs?

a function of the mental excitement I am experiencing at the moment.  This is usually a function of the excitement that I detect from the woman, usually as facial or verbal expressions.

for you to get to 72 [or more] strokes per minute TIMES how many minutes from penetration to climax.

And yes, she will get mad when you keel over and croak on top of her due to a cardiac event from excessive stroking.  I mean, is there a speed limit you might think about observing depending upon your age and overall physical condition?  And don't you want to do stuff like vary the rate, depth of penetration and the like? Just to keep it interesing?

And, don't forget, more than a few providers are thinking hurry up and finish you @##$%&*%.