When practicing the art of learning to keep a penny between my knees

Question

how long is an appropriate amount of time to keep the penny there?

via my Mother in law.

Answer 1

Until the interest compounds into a nickel?  What in the world are you talking about, sister???!?

Answer 2

I had not yet heard of having a penny between your legs

try having it for a few minutes? try google for your answer

Answer 3

That expression was an old euphemism told to young, unmarried ladies, that they should not have s*x before marriage, and that by keeping a penny between the knees, she would not have s*x.

That's the nicest way I could put it. I might have gotten a violation for my other explanation.

Edit:  If your M-I-L said that to you, I would take that as an insult. She is saying that you are not good enough to have s*x with her 'Little Boy'.