Never. You're way too healthy in (your) body and your mind.... :D
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It would be an interesting experiment to determine whether the tightness of the fabric affects the acceleration of the buttocks motion up or down. I'm sure it had an effect on your speed of movement. :D
We men build pyramids, bridges, skyscrapers, break the sound barrier, fly to the moon, dive to the depths of every ocean on the planet and after all that we can still be distracted enough to drive our cars into trees by that magic sight.
Excellent analysis. ;)