I automatically assumed this was about periods. Is that sexist? I don't think it's sexist because when I opened it, it was actually about periods. OP, you're sexist.
OP obsesses over Osun and now OP wants to know when girls have their periods. By research do you mean you're gonna make a ovulation chart XD
Perhaps to lend legitimacy to your query, you might enlighten us as to you research thesis? A synopsis is fine, we need not review the entire proposal.