no caste

Initiation rites (physical sexual maturity) are pretty interesting, as they kind of imprint, or begin to imprint, a conceptual overlay on experience. Can't speak for first ejaculation lol {well maybe, that was way later} but first menses would be it for a girl-woman. That and the breasts beginning to grow. For a boy-man, growing hair I suppose. Before puberty? I haven't observed a lot of difference between boys and girls.