You Won't Believe How This 30,000 Year Old $ex Toy Was Used - It turns out that dildos weren’t always used exclusively for igniting metaphorical fires of desire. The world’s oldest known dildo, a silt stone phallus, also shows evidence of being struck against a flint rock to ignite fires. Talk about a multifunctional sex toy. This stone cock was excavated from a German cave used by modern homosapiens. Rings are carved around one polished end, giving the stone a definite phallic shape.