My 8 year old knows too much! Help

[Mrsmilligan]

Any advice gratefully received about this.
My 8 yr old is very bright, and has a reading age far beyond her actual years. Fab some might say but for us it's turning into a nightmare. She has discovered 'sexual intercourse' in the dictionary and in the 'How The Body Works' book. On confronting Granny on what 'intercourse' was, a shocked Granny explained in a simple way. Now it seems my 8 yr old see's it everywhere, from kisses on the tv to the kiss in Harry Potter. She has practised on her younger sister and has played 'having babies with her friends, (their parents have tried to be understanding but understandably don't want their children to know yet! Because they're 8!!! )
Does anyone else have the same problem?
And what can we do?
I've had a calm conversation explaining that the only person adult or child she should talk to about it all is us, her parents, and that she musn't inform others her age as its too young and up to their parents. But I'm worried.

8 is the perfect age to know about these things.
Old enough to properly understand and too young to be embarrassed.

I told DD2 the facts of life when she was 8, we were going to brownies.

I'm not sure when I told DD1 about that age I guess.

And I'm told I've always known them.
Because I was the sort of toddler who asked why continuously.

Are you serious?

Reading 'sexual intercourse' in the dictionary is a right of passage for kids that age (or younger) - it's nothing outstanding.

I know plenty of much, much younger children who are fully aware of how babies are made.

It's human reproduction.

It is really not on to tell your daughter what she can and can't talk to her peers about. You are going to give her a complex about it all if you carry on like this.

There is nothing to worry about, leave them be.

I think that if she kisses her sister and thinks that she is having intercourse, then you can't say that she understands.

Either explain it properly to her, and tell her that it is a grown up thing, or just let her get on with being a child.