A boy wanted to have sex with his girlfriend. But she was refusing all the time. So he went to see his friend and asked him what to do about it. His friend had a brilliant plan. He said: "Next time you meet her under the tree behind your home. I will be up in the tree waiting for you. If she refuses again you ask God in the heaven whether you can have sex with her or not. And I will give the right answer to you and her."
The days went by and one Saturday afternoon he met his girlfriend again. They both went to that tree and he asked her to have sex. She refused. So he said to her: "And, my dear, if I ask God in heaven, would you follow his advise?" "Yes, I would" she said. So he asked: "Father in heaven can I have sex with my girlfriend?" And the voice from heaven said: "OK my friend, go ahead!" And so they had sex the first time.
But the boy asked his friend to do him this favor every week, and he did. But the last time when he asked God in heaven, the father answered: "My dear friend below, step aside and let your father in heaven have a go!"