I agree that it's better to Let Them Stupid, but MN has spoken, so hey.
I've been driven back to my old Chambers Twentieth Century Dictionary (1983 edition, so obviously old-fashioned, but language sits on its foundations).
Thelarche: the word used by the now-deleted poster to describe the process of breast development. Not there at all, evidently a medical coinage either very rare then or not yet in use (Chambers is generally good on technical terms, if it was in regular use it would have been included).
Gender: noun; kind: grammatical; a distinction of words roughly answering to sex; loosely or jocularly; sex.
So that's that. As we have pointed out, there is a new usage to go with the new word. Orwell thou shouldst be living at this hour.
and further:
Accost: verb; to approach and address; to speak first to, to solicit as a prostitute.
Approach: to bring near, to come near to in any sense, to come into personal relations with, to resemble.
So that's why I didn't use approach - it carries a connotation of not necessarily speaking, of stealth. Accost is honest and direct, and describes what happened without value judgement.