I found by doing the search "young female solo male" that there's nearly 8 pages of solo females, but for some reason these are tagged with 'male', when there's not even any males in them!
I'm going to remove the male tags, but with so many pages it'll take me a while so I'd appreciate help.
EDIT: Some of these are wrongly tagged as 'solo', but mostly wrongly tagged with male.
EDIT 2: Looking into tag history, it looks like at one point shota was aliased to female and loli to male, which seems to have caused this problem.
Updated by RenaKunisaki