My girlfriend recently caught her twelve year old daughter masturbating. That led to a discussion about how young a girl can be to experience a full orgasm. My girlfriend said she was about fifteen when she came for the first time.
I seem to recll I started jaculating when I was about twelve, although I had been "playing with myself" and enjoying the sensation since I was quite young.
We really want to have a full discussion with her daughter about the pleasures and dangers of sex so any advice will be appreciated.