Maybe... My initial reaction was no... But you're obviously asking for a reason????

If I was to, I would probably tuck little notes away in my private drawers, boxes, whatever, with a friendly "I really appreciate you helping us out, but this drawer/box contains personal materials so please entertain yourself another way". Or I would pop some bits and peices in places to stir them up, you know a porn magazine here or there, maybe a dildo, accompanied by a little note "thought we'd make this a bit more entertaining for you".
LOL that was my thought too! and setting up a few tiny camera's that go in the room he/she not allowed in :P