Femboy is an aesthetic, not a gender identity. r/femboy accepts submissions from cis men, trans men, trans women, and enbies, and there's no particular preference for or against any of them as far as upvote counts go. The top voted of all time page has at least one of each in the top 10.Bruh femboys identify as boys you're mistaken for trans and so is the dev lol
Femboy = man
Trans (mtf) = women
Trans (ftm) man
Tomgirl = femboy
Tomboy = women
Trap = femboy or trans women (depends)
But for the purposes of the tags, whether it should be tagged with "gay" or "lesbian" content is dependent on if the femboys identify as men or women, and most of them currently in the game are women. If future builds have more male femboys and they have sex with other men then the tags can be revisited.
We'd be having the same conversation if a tomboy fetish game had male tomboys, whether cis or trans. And if we do, make sure to tag me, I'm a big fan of tomboys getting plapped.