I have never seen a handcuff key, so I had to go to Google Images and see what they look like. They apparently come in 'disguises', too: one is part of a belt buckle, and one is a ring.

I've read about guys keeping one taped to their body, like on their lower back, just in case they're handcuffed with their hands behind them.

Funny thing, though... I've never even heard of a woman carrying a handcuff key. I wonder why that is???

Sue