Rory got the idea after watching a documentary about Google Earth — which lets internet users view satellite pictures.
He secretly took a pot of white paint and climbed up to the roof, where he spent half an hour reproducing the bizarre but world famous artwork of the Cerne Abbas Giant in Dorset.
Only a year later, his secret was discovered when a helicopter pilot spotted it, and hovered so his passenger could take photos.
Rory's father Andy, 54, thought it was a prank when The Sun contacted him about the painting.
He said: "It’s an April Fool’s joke, right? There’s no way there’s a 60ft phallus on top of my house."
Andy then spoke to all four of his kids demanding answers.
The Cerne Abbas Giant is regarded as a massive fertility symbol, and couples often have sex on his appendage in the hope of conceiving.
Rory’s mum Clare, 49, said: "We don’t want any more children, so the idea of sleeping under a giant fertility symbol is rather worrying."
Andy added: "We don’t want to lie in bed at night and hear couples at it above us.
"When Rory gets home he will be given a scrubbing brush and white spirit and he can go and scrub it off."
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