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This fantastic video of a very voluptuous young lady riding shotgun in some of the most exotic cars around is a sure-fire hit.

They refer to this as the “Stiffness Test”—an experiment conducted purely for “scientific reasons,” of course.

Related: Check out these two hotties as they take this fast car for a spin

If I had to draw a conclusion based purely on the variables at hand, I would suggest this experiment be conducted repeatedly. And with multiple subjects.