The tag alias #78574 riding -> riding_(disambiguation) is pending approval.

Reason: It's not promising when the wiki itself says 'often mistagged' and the first four images are mistags.

Also there's a bunch of tags that need aliasing/addressing like cycling vs riding_bike and horse_riding and riding_horse and riding_dildo.

I think it'd be nice to establish some tags like riding_on_another that can have riding_on_*bodypart* implicated to it. Since feral/taur mounts are a common thing, that might warrant its own tag like riding_on_feral/taur or riding_on_mount. Alternatively, the less common riding_on_anthro/humanoid could be tagged.
A similar group of tags for riding_on_object and riding_vehicle could also be helpful.