What about F/F/M polyamory?
Probably not for Sunset, sorry!
What if a work features both a femslash and non-femslash ship equally?
If you feel it would fit in with the theme of Sunset, you're welcome to post it here.
Is this just for fanworks? Can I post original works?
Yes, you can! There is an entire category for it. As long as the prominent relationship(s) in the Original Work involve at least one F/F, NB/F, or NB/NB pairing, you can post it.