How to Tell If Your Dentist's a Virgin

Dentist: You don't have any allergies, do you?
Patient: Penicillin.
Dentist: But no latex allergies or anything like that?
Patient: No! Oh my God, no! Wow. That would be totally horrible and depressing.
Dentist: Why, are you a med student or something?
Patient: ...No.

--Columbia University Dental Practice, Amsterdam Ave