Headcanon: one of the first things Vaggie did to reclaim an identity for herself outside of being heaven's soldier is to try more feminine clothing, something she never used to let herself wear because it's impractical for a fighter(like growing her hair). It was an awkward transition, but Charlie's very enthusiastic encouragement helped Vaggie love her new look.
"Sex is what makes us human" is stupid. Almost every species fucks. Humans are the only species that jumps motorcycles over school buses that are on fire. Some other things too probably