Anyone used a woman’s hair tie as a cock ring?

Can't say I've ever done this, and will not rule out it happening one day

But I can tell you what I have thought about, as far as a cock ring.

Get a good metal ring, and forget I am wearing it. So when I set off a metal detector at the airport, I can get a nice pat down, maybe a strip search where I can gain some exhibitionism points , with being seen and exposed in my jockstrap, ultimately having to expose the metal source.