Despite FFM threesomes not being lesbian (female/female), some are being tagged as such.
When I tried to fix the tagging of some posts, I was flagged for Tagging Abuse/Tagging Vandalism. This makes no sense to me.

I'll state an apparently very controversial fact: Lesbians aren't into guys.

So basically, the current tagging system is pretty flawed around this.

Posts aren't tagged by the supposed sexual preferences of the characters, they're tagged by what's visible. If two females are interacting sexually, then the post is tagged with female/female.

if a female character is interacting sexually or romantically with another female character it's tagged as female/female period. f/f and bisexual are not mutually exclusive, read the wiki.

"lesbian", "gay", and "straight" aren't really fully valid general tags since they are about what a character _is_ rather than what a post _contains_. they're aliased to female/female, male/male, and male/female since in a grand majority of cases this is what the posts the tags were on contained.

f/f =/= lesbian

If you're looking for exclusively "lesbian" posts, I would search "female/female -male -intersex" and you could also possibly toss -ambiguous_gender on that as well.

"female/female duo" would also work, but would exclude any posts of 3+ females.

That actually makes sense. I'm sorry for getting a bit mad in my original post. I was just annoyed that a moderator made notes on my account and reversed the changes without explaining why at all. Thank you for explaining.

I was the one who rolled back your changes, not a moderator.
I should have left a note in the change reason as to why your tags were wrong. I apologize for not doing so.