> Every blue moon, they're in an uncomfortable position; a little jiggle sets things right.

Uncomfortable position is a thing, but also just the wrong pressure in the wrong spot can literally feel like someone has punched you right in the balls full force. But it goes away immediately when you reposition. I literally never think about it.

I've heard in rare cases people can end up with severe frequent pain which would be awful, but AIUI the risk is very low for that.