Probably account sharing then.
What if it's multiple possessions? Would it be a 'first one free' situation on the policy? Would we get extra penalized for multiple users if our body is a demonic timeshare?
Since the status and well-being of your immortal soul is your own responsibility, I'm going to file this under "account sharing" as it would be akin to being careless with your passwords and who you share it with.
Share your soul responsibly!