Jim is planning to marry, he is, and asks his family doctor how he could tell if his bride-to-be is still a virgin.
His doctor says,
"Jim, all of us use three things for what we call a Do-It-Yourself Virginity Test Kit, which consist of a small can of red paint, a small can of blue paint and a shovel."
Jim asks, "Aye, and what do I do with these things, doctor?"
The doctor replies,
"Before you climb into bed on your wedding night, you paint one of your ваlls red and the other ball blue. If she says, 'That's the strangest pair of ваlls I've ever seen', you hit her with the shovel."