Well, here's some folklore you don't read every day...

Look, it's from the Japan Today news site, so it's perfectly legit that I stumbled across it:

Every spring, thousands of tourists from Japan and overseas descend on a shrine in Tokyo’s neighboring prefecture of Kanagawa to celebrate one thing — the penis.

This symbol of fertility is at the centre of the Kanamara Matsuri (“Festival of the Steel Phallus”), which ranks as one of Japan’s kisai or “bizarre festivals“, and the story behind it is just as bizarre as the festival itself.

According to legend, a demon once sought revenge on a woman who rejected him by taking up residence inside her vagina and biting down on her husband’s penis so she was unable to procreate. In order to solve the problem, the woman paid a blacksmith to create a steel phallus to break the demon’s teeth, which he did, ultimately restoring her fertility.

All's well that ends well, I suppose.

The rest of the story at the link is pretty amusing too - the shrine has had to distance itself from an unofficial human-inside-giant-walking-penis mascot at the festival.