Vaseline Survey

A male market researcher was calling on homes on behalf of Vaseline. A woman answered the door.

"Do you use Vaseline?" asked the researcher.
"Certainly," she said. "It's very good for cuts, grazes and burns."
"And what about anything else?" he asked.
"Like what?" He became embarrassed. "Well, sex, maybe."
"Oh, of course." she said. "I smear it on the bedroom doorknob to keep my husband out."