I suppose it would be okay for men and teen girls to bath together if there is no “evidence” the men are getting any kinky thrills from it.
There is such a thing as “appearances” and eschewing a behavior that invites misconduct— and do please forgive me but I still believe in women behaving as ladies and men as gentlemen and can trace the whole history of America going to Hell from when the country abandoned those honorable conservative principles.
Lesbian gym coaches and principals have prurient interest in girls too.