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I've noticed a lot of squirrels outside my window
The only problem I've heard of for oils generally, for anal use, is that they can form a seal against the rectum and something about providing a safe haven for bugs that shouldn't be there. I'd guess though that so long as the person is taking a shit regularly then any residue would get removed. I'd say just use a minimum amount needed for lube.
This link gives some suggestions for lubes generally