The bulk update request #12700 has been rejected.
remove alias anthro/anthro (0) -> anthro_on_anthro (280580)
remove alias anthro/feral (0) -> anthro_on_feral (39177)
remove alias anthro/human (0) -> human_on_anthro (103612)
remove alias anthro/humanoid (0) -> humanoid_on_anthro (15988)
remove alias anthro/taur (0) -> anthro_on_taur (1177)
remove alias feral/feral (0) -> feral_on_feral (54196)
remove alias feral/human (0) -> human_on_feral (47146)
remove alias feral/humanoid (0) -> humanoid_on_feral (5631)
remove alias feral/taur (0) -> feral_on_taur (319)
remove alias human/human (0) -> human_on_human (1514)
remove alias human/humanoid (0) -> human_on_humanoid (32846)
remove alias human/taur (0) -> human_on_taur (809)
remove alias humanoid/humanoid (0) -> humanoid_on_humanoid (11072)
remove alias humanoid/taur (0) -> humanoid_on_taur (439)
remove alias taur/taur (0) -> taur_on_taur (607)
Never mind, a more comprehensive version of this BUR already exists at topic #46115.
I looked, but couldn't find any discussion on why these aliases were made in this direction. I've always found it inconsistent that they're in the format x_on_y when gender pairing tags use the x/y format. I think this would be preferable both for consistency and for making the tags slightly shorter. (It may also reduce complaints and confusion from people who think x_on_y means x_penetrating_y.)
I also don't know what the logic for the word order is supposed to be. I went with alphabetical order (so, anthro takes priority over feral, then human, etc.)
EDIT: The bulk update request #12700 (forum #473824) has been rejected by @Beholding.
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