This guy knocks on a door

One day, while doing door-to-door market research, this guy knocks on a door and is greeted by a beautiful young housewife.

He’s inquiring about a particular petroleum jelly product to see how it’s being used, and by whom.

“Hello,” he starts, “I’m doing some research for a petroleum jelly manufacturer. Have you ever used the product?”

“Yes. My husband and I use it during make love,” she answers.

The researcher is stunned by the blunt reply but quickly regains his composure.

“Um, er… I admire you for your honesty,” he continues.

“Can you tell me exactly how you use it?”

“Sure, we put it on the doorknob so the kids can’t get in.”