FFM Threesome Hentai
Three active participants in group sex, with the specified gender combination (F = Female, M = Male).
Content should also have the Group tag.
Any participant who falls outside of the F/M binary count as whatever "role" they most closely resembles.
In other words, a trans woman, a man transformed into a woman, or an alien with a mostly human-female anatomy all count as an F in the group. Further distinctions can be inferred from accompanying tags.
