I thought Femboy was aliased to Feminine_male, not the other way around.

since the tag can occasionally be applied to andromorph and maleherm characters we wanted to avoid putting the word "male" in there since that word has a fairly strict definition in tags.

the tag was originally girly, it was changed to femboy for a couple reasons, one being that the old tagname was being applied to all 7 gender categories, rather than just the 3 it was meant for.