The bulk update request #2565 is pending approval.

create alias human_on_female (0) -> female_on_human (46532)
create alias human_on_male (0) -> male_on_human (25225)
create alias anthro_on_male (2) -> male_on_anthro (38315)
create alias tentacle_on_male (31) -> tentacles_on_male (788)
mass update monster_on_male -> male_on_anthro

Reason: Reversed versions of a few different tags in use, and some plural.
I don't know a good target point for an alias of monster_on_male but the contents look mostly anthro currently so to be transferred there is probably the pest target.
monster_on_female Just needs cleanup in general if anyone wants a tag project.

Don’t those indicate which one is on top and which one is on bottom?

watchdog22 said:
Don’t those indicate which one is on top and which one is on bottom?

no, that has never been the case.
female_on_human male_on_top