You have turned OFF your PM. You cannto ask another question till it is Turned ON.
If she does not share such a bond where you both can comfortably talk about sex and you are sure that she will get angry on you then you should not talk about sex with her and no need to take the risk of your friendship. If she is considering you a nice friend then you should respect her friendship and play the role responsible friend rather than a pervert boy.
If you are so adamant to talk to her on such topic then the first thing you should do is, make her comfortable with you and share a bond where you both can have sex talk and sex too.