It is one of those teacher cliches to say there are no stupid questions. Bur as evidence to the contrary allow me to present this reader-submitted question from the February 1965 issue of Sexology magazine.
"Dear Doctor: during sexual relations with my wife I always have to manipulate her clitoris until she reaches orgasm. My wife says that during relations my penis never touched her clitoris. As far as I can see, what we are doing amounts to masturbation, only I am doing it to her instead of she doing it to herself. Will this endanger her health and make her sterile?"