Why the bloody heck is "armpits" a invalid tag? It shows 9k images under it and honestly, it's a pretty good tag...
It's so much better to find some that have exactly it in them, plus, many are clearly armpit fetish/kink but not many tag it like that, really sad that the site keeps cutting down some really good tags... Feels like some day there will be only tags for the genders and nothing else at this rate :/
Genders probably also have some weird ass names that make no sense and mixing genders since for whatever the damn reason "Dickgirl" is considered the same as "Futanari" for incredibly massive reasons, but that is other issues...
Don't normally use the forums but come on, invalid tags for once useful tags is really frustrating!