Maybe it is one theory plus this one : to have a smell that appeales to them. I mean, if ur going to, say, grrom yourself with that, you could self annoint off of a smell you enjoy to hit 2 birds with 1 stone.
Oh! maybe to smell nice for mates! I heard of another theory before that scientist thought... but I 4get.
The smelling nice for mates thing occurred to me too. Since I think they normally anoint with food couldn't it be like "see I know all the best place to eat"
That would also be a reason males are more frequent annointers than females.
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