As of writing this post, young_on_young is tagged on 4,453 posts, adult_on_cub is tagged on 332 (partially due to my work until I noticed this), and there are other such tags like adult_on_teenager and teenager_on_teenager. However, cub_on_cub is aliased to cub, which to me implies that these tags potentially should not exist. Should they? And if we do allow them to exist, should we bring back cub_on_cub? Should we run a BUR to change them to things like cub/cub, adult/cub, cub/teenager, etc, like we have with gender tags?

This
I created some of these tags, because I didn't see a good reason for not having them.