Hi S.:
As some of the other mothers have mentioned,13 is A little late for A sex talk. Its sad,but the true reality is,some girls this age have already experienced sex.Parents such as your friend, are under the delusion that the longer they hold off discussing it,and the less their daughters know,the better off they'll be.. The parents believe (Ignorance is bliss.)I'm sorry,if that sounds harsh on the parents, but,I feel sorry for these young girls who begin womenhood,and experience changes in their body and their emotions,and are left to try and figure out what it all means,on their own.God bless the lonesome,awkward girl,who hasn't any friends or siblings,that she can turn to for help,or someone to explain that what she is feeling and experiencing is (normal)Its obvious to me,that your friends daughter,(NEEDS YOU)Her mother is not capable,or willing to speak to her daughter about sex. There is no question,about whos duty it was,I think now,its important to make sure this girl is given some help,some guidance from someone,with understanding and compassion.This young lady needs someone mature and responsible enough to speak to her.You may sit with her,only to discover she knows (more than you)! lol. What I would do, is tell her in private, that for what ever reason,her mother has great difficulty discussing sex with her,and asked you to answer any questions that she may have unanswered? Tell her that you are only there to help,and that there is no such thing as a (stupid question) "Ask anything and I will give you the best answer I possibly can" I know S.,that you feel this a strange request from your friend,but try to look at it,as your helping a young girl,that otherwise would be left in the dark.You could make a difference in her life choices. I wish you only the best,no matter what you decide is.J.