Ways to tell who you are making love to

Q: How do you tell if you're making love to a nurse, a schoolteacher, or an airline stewardess?

A: A nurse says: "This won't hurt a bit. "

A schoolteacher says, "We're going to have to do this over and over again until we get it right. "

An airline stewardess says, "Just hold this over your mouth and nose, and breath normally. "