I think this is more of an urban legend than reality.
However, there WAS that episode of "Grey's Anatomy" where the man's PA got caught on the woman's IUD and he got stuck inside her! :biggrin1: Now that I can imagine actually happening! But not otherwise.
Oh, man, I missed that episode, and I'm glad! When IUDs were more common in the 70s, there were bunches of times when I'd be up to the hilt inside my partner, and bumping into her IUD, and working to give her full penetration without slamming the sensitive skin on my cockhead into the sharp little edges of the IUD.
When I read this subject about getting stuck inside, I thought, "well, that's silly, you wait for the cock to get softer and smaller and slide right out." But getting a PA caught in an IUD ... that seems definitely possible ... although my guess is that IF I had a PA, and IF I got it caught in an IUD, I'd end up pulling out the IUD through the woman's vagina, which would be painful but over with before either of us knew what the hell was going on. Not that I'm a doctor, or a PA owner, or an IUD owner, for that matter ...