I’m reminded of another Osho joke…

The professor asked the young girl in his psychology class, "Which part of the body expands to ten times its natural size under an emotional impact?"
Blushing, the girl replied, "I would rather not answer that."

The professor called on the boy sitting next to her who promptly replied, "The pupil of the eye."
The professor turned back to the girl and said, "Your confusion shows three things. One, that you did not do your homework; two, that you have a dirty mind; and three, that one day you will be sadly disappointed."