The bulk update request #11435 is pending approval.
create alias butt_against_glass (8) -> ass_on_glass (1884)
create alias anus_against_glass (0) -> anus_on_glass (134)
create alias balls_against_glass (0) -> balls_on_glass (455)
create alias belly_against_glass (0) -> belly_on_glass (186)
create alias penis_against_glass (14) -> penis_on_glass (233)
create alias hand_against_glass (0) -> hand_on_glass (296)
create alias hands_on_glass (43) -> hand_on_glass (296)
create alias hands_against_glass (47) -> hand_on_glass (296)
create alias tongue_against_glass (0) -> tongue_on_glass (107)
Reason: Adds *_against_glass aliases to all *_on_glass subtags documented on the wiki, except for sitting_on_glass since the alias has no tag history and makes less sense.
pussy_on_glass is deliberately omitted pending the move to vulva.
I am uncertain whether licking_glass should be aliased to or merely implicate tongue_against_glass. The wiki mentions that the tongue can be simply laying across glass and not actively licking it. This distinction may be too narrow and aliasing may be better, but then licking glass cannot for sure imply licking.