How do you decide to designate something as more animalistic or human. Is is caring for children animal or human? Being socially pleasant? What makes attending

How do you decide to designate something as more animalistic or human. Is is caring for children animal or human? Being socially pleasant? What makes attending a naturist summer camp animalistic? FWIW, the majority of recent, western naturist subcultures came from rationalist origins... a sort of late enlightenment movement. They pondered why we behave as we do, and rejected rote knowledge. IE, they thought we culturally avoid nudity today just because we avoided it yesterday. It's a thoughtless, irrational habit. Being rational, thoughtful and highly evolved beings, naturalists decided they don't have to keep up pointless habits. Humans can decide to evolve by their own volition, their own rational conclusions. This is pretty closely related to humanist thought broadly. So, why is naturism more animal than human? More importantly (to me), how can mindless adherence to tradition, custom, religion or habit possibly represent "choosing to use our superior faculties and ingenuity" or "evolving by our own volition." it seems to me that conscious, and free choice represents those things much better.