"Not as far as I know. But the only time it comes up except as an inconvenience for demons who'd be safe without the precautions is when a really desperate summoner gets a really nasty demon, so I haven't taken steps - not that I had much chance - to make this known. Since I'd rather they trade something meaningless and the summoner be scared instead of, like, raped or tortured or comatose-while-the-demon-runs-off-cackling."