FINISHED?

I have a simple question that won’t let me relax

How can you determine as a matter of fact?

Whether they’re on their fronts or their backs

When an eighteen thirty girl reaches climax?

If really difficult to tell when she never reacts

Some say, “who cares” and just make tracks

Does she drops her nail-file or ask for a snack

Or does the bloke behind slap you on the back