The bulk update request #11556 is pending approval.
create alias breast_to_breast (169) -> breasts_frottage (10634)
create alias breasts_to_breasts (0) -> breasts_frottage (10634)
create alias boob_to_boob (0) -> breasts_frottage (10634)
create alias boobs_to_boobs (0) -> breasts_frottage (10634)
create alias bust_to_bust (0) -> breasts_frottage (10634)
Reason: Aliases away some terms that mean roughly the same thing. breast_to_breast is by far the most common. boobs_to_boobs is unused but included for full coverage.
Tag history:
https://e621.net/post_versions?commit=Search&search%5Btags_added%5D=breast_to_breast
https://e621.net/post_versions?commit=Search&search%5Btags_added%5D=breasts_to_breasts
https://e621.net/post_versions?commit=Search&search%5Btags_added%5D=boob_to_boob
https://e621.net/post_versions?commit=Search&search%5Btags_added%5D=boobs_to_boobs
https://e621.net/post_versions?commit=Search&search%5Btags_added%5D=bust_to_bust