Some time ago there was a lot of discussion about gay and gender tags, and somewhere was idea of introducing tags prefixed with 'stated'. Then I saw usage of stated_homosexuality, and I thought that maybe it was indeed introduced. But now, I've looked at this and those tags are mess (stated_lesbian should be aliased to stated_homosexuality, or instead stated_homosexuality there should be stated_gay), and very rarely used.
So, anyway, they need an alias, either aforementioned, or to invalid_tag.
Updated by Rainbow Dash