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gentlemen riders, while transporting fair young maidens, often discover to their delight that a man's back is quite sensitive and discerning when the frontal anatomy of the female persuasion experiences the mild to medium g-forces created by somewhat harsher braking than is actually required for the task at hand.
a traditional "sorry, thought i saw another bunny at roadside" is often enough to appease the semi-involuntary evaluation of the curves and contours found directly behind oneself.
doesn't hurt to buy dinner either.

another popular pasttime with pillioneers is the "find the rpm game", where the rider holds a steady speed, while demonstrating different rpm levels available, utilizing the numerous gears. this passenger participant experience to find what is the "most pleasant" vibration level is the ultimate gesture of gentlemanly unselfishness.
it can also lead to a ride cut short, sometimes completely skipping the dinner part.
it's possible that the term "your mileage may vary" has roots in this tradition.
sidebar: the latter is particularly popular with the harley davidson marque, and not so much with gold wing passengers.