A man doing market research for Vaseline contacted a young mother of three and asked  ' Have you ever used our product?'

She says, 'Yes. My husband and I use it all the time.'

'And if you don't mind me asking, what do you use it for?'

'We use it for sex.'

The researcher was a little surprised;'Usually people lie say that they use it on a child's bicycle chain or to help with a gate hinge. But, in fact, we know that most people do use it for sex. I admire you for your honesty. Since you've been frank so far, can you tell me exactly how you use it for sex?'

The woman says, 'I don't mind telling you at all... We put it on the door knob to keep the kids out.'