"Anatomy Class" joke

"Ms. Perkins," said the biology teacher, his eyes pinning the daydreaming student, "would you please tell the class which portion of the human anatomy swells to ten times its normal size during periods of agitation or emotional excitement?"

Blushing, the woman stammered: "Professor, I-I would r-rather n-not answer that q-question."

Arching a brow, the professor asked: "Oh? And why not?"

"W-well, s-sir, that's kind of. . . p-personal."

"Not at all," he blustered.

"The correct answer is the pupil of the eye, and your response tells me two things: First, that you didn't read last night's assignment, and second, that marriage is going to leave you a tremendously disappointed young woman."