Bec, I am so sorry for your pain and you too Soul, as a teacher one of the things we are taught to look for is inappropriate sexual knowledge in children as this is often a sign they have been abused.
My problem with this issue when I was a teenager was that my parents were VERY religious so sex outside marriage was just forbidden and no discussion will be entered into. There fore when I did sleep with someone for the first time I felt like I had to stay with him and ended up in a really emotionally abusive relationship for a long time because i felt like I must cause I had slept with him.
Its so hard to find that happy medium isn't it? I think motherhood of a teen is sooo hard ATM I find Riley a breath of fresh air cause its so easy!!!
Soul- i think your DD sounds like a sensible and wise kid and you have a great relationship with her.