It all how you construct the bet ...

A college professor tried to prove sexual arousal was an involuntary process. He said, "If you can command yourself to be sexually aroused right now, to command an erection or engorged vaginal tissue, I'll give you $20! Take thirty seconds. Not enough? You want a minute? Go ahead! In all the years of teaching this class nobody has ever walked up and taken the $20."

From the back a man replied, "Maybe because we're so hard if we stood up we'd trip over the desk!"

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