How do you use vaseline?

A market researcher called at a house and his knock was answered by a young attractive woman with three small children running around her. He asked her if she minded replying to his questions and when she agreed, he asked her if she knew his company, Cheseborough- Ponds. When she said no, he mentioned that among their many products was : Vaseline
She certainly knew of that product. When asked if she used it, the answer was “Yes”.?
Asked how she used it, she said “To assist in the performance of sexual intercourse.”
The interviewer was amazed. He said “I always ask that question because everyone uses our product and they always lie and say they use it for the child’s bicycle chain, or the gate hinge; but we know that most use it for sexual intercourse. Ma’am, Since you’ve been so frank, could you tell me exactly how you use it?”

“Sure, we put it on the bedroom door knob to keep the kids out."