historically, in some tribal societies, a man would go off into the wilderness alone, and if he survived for a period of time, he would return to the tribe and relate his story, and be considered a man.
Women similarly would mark the onset of menstruation in various ways.
these days, perhaps the modern rites of passage include passing a driving test, becoming able to vote, owning a mobile phone and having a bank account, none of which really involve gender at all.
can you think of any modern rites of passage which are gender specific?
is it important for there be to be some rite of passage to mark the transition to adulthood as a man or woman (from being a boy or girl), or is becoming a legal adult sufficient?