The bulk update request #11498 is pending approval.

create alias presenting_asshole (0) -> presenting_anus (55839)
create alias presenting_tailhole (0) -> presenting_anus (55839)
create alias presenting_cock (0) -> presenting_penis (27137)
create alias presenting_dick (0) -> presenting_penis (27137)

Reason: Adds aliases for some common synonyms.

Tag history:
https://e621.net/post_versions?commit=Search&search%5Btags_added%5D=presenting_asshole
https://e621.net/post_versions?commit=Search&search%5Btags_added%5D=presenting_tailhole
https://e621.net/post_versions?commit=Search&search%5Btags_added%5D=presenting_cock
https://e621.net/post_versions?commit=Search&search%5Btags_added%5D=presenting_dick

Although presenting_asshole and presenting_tailhole haven't been tagged much, I figure it's a good idea to add them for newer users who are unfamiliar with our more clinical usage of anus since aliasing it to a populated tag could encourage people to tag it instead of dissuading them if it's empty.