I'm not too sure exactly what you're talking about, or even asking.

Please help me try to understand it:
Do you consider it wrong for people to kiss? Or is it just wrong if they kiss outside of marriage?
Or is it that you have an issue with two little girls kissing?
Would you be happier about it if it were, say, a boy and a girl? Or two boys?

See, I'm not sure WHY or HOW you can say that "...they knew it was wrong..." - at 6 & 7 years old, they're not kissing each other as part of a sexual exploration/experimentation process - they're playing an innocent game, probably mimicking what they should see their parents (well, obviously not your daughter's parents!) doing as a normal part of daily married/cohabitative affection. Why is that bad?

Would you rather they roped in the little boy from down the road to play that game with them?

Would you rather they DIDN'T see normal physical affection (hugs, kisses, holding hands) as a part of normal life?

Or do you figure on observing and controlling every single aspect of their social development from now until their wedding-night(s)?

Perhaps you should ask yourself why YOU think it is/was wrong, and why you think you should make be making such a big deal of it and making these innocent little girls aware of things they shouldn't really be taking seriously until they're much older. Ask yourself why you're transferring your own feelings of 'guilt' and 'dirtiness' onto these innocent little girls. Ask yourself if making such a big deal of this innocent and absolutely normal childlike behaviour is actually good for these little children, and if by reacting in this heavy-handed, officious manner you are helping or hindering your daughter's development and eventual maturity. Be brutally honest with yourself while you're at it. You're probably not going to like the answers, though...

Because I don't see anything in your posting about 'fondling' or 'groping' or inappropriate nudity - just an embrace and a kiss - and unless you've neglected to tell us a lot of what must be incredibly sordid detail, this was obviously just an innocent game which you've now turned into something ugly.

Well, OP, what's YOUR answer on this?

Guest, I didn't see anything about 'french-kissing' or anything like that - the OP said "...embraced in a kiss..." - nothing more, nothing less.
You assume that the OP did nothing except 'talk' to the children about this - but that too is not made clear. Neither is the manner in which the OP 'talked' made clear...

As I often remind my protege's - When you 'assume', you make an ASS of U and ME!

Unless we know EXACTLY what was going on between the children, and EXACTLY what was said and/or done by the OP, then we're just making assumptions. Which is why I asked the OP to clarify the situation.

Even just talking about something to innocent children in a way that makes those children feel that it was a terrible thing to have done, creates problems for those children, sometimes for the rest of their lives. Repression of emotions and thoughts is NOT, contrary to what the apartheid regime in its heyday with its draconian censorship laws and obedient police force enforcing same would have had us believe, good for anybody.

I believe that the reason we're all here is to make things BETTER for our children, not more difficult. Unless we have all the facts, though, any advice we give is probably going to be useless. Which is why we need ALL the relevant details about problems encountered and consulted upon - how many threads have deteriorated into slanging matches because of assumptions made by one or other (normally anonymous "Guest") posters? Go and have a look...

I agree with gemstonejhb. It's not a big deal - but it might be worth having a quiet non-threatening chat with your daughter, just to establish how the kissing came about and what she thought about it. My own daughter is 7 - and she and her best friend have recently discovered the delights of skinny-dipping. To them it's entirely natural and fun...it's only socially-aware adults who might see something sinister in that - or kissing! Kids of that age don't really have hang-ups....they only really develop hang-ups when adults start getting on their cases about stuff they regard as innocent and fun.

I agree with the other posters what was your issue? It was an innocent game between 2 innocent girls.

Dear Guest, why is it wrong for the grils to kiss when playing marriage? Obviously you are the daddy to think like this. I know boys don't play like that but girls do, I'm surprised your wife thought it wrong, being a girl herself. It just shows that they have loving parents and are learing to be loving adults. Since when are only adults allowed to kiss. Women and girls kiss each other all the time, of course, not french kissing, but still. Allow your children to learn about the good things in life.

I think you just just be careful and observe them if they continue like this, especially as they get older.

Same thing happened to my cousin and a friend years ago, and everyone was like "awww, cute" and all that, and now they are lesbians, much to the chagrin of their respective parents. If it worries you, do want to can to keep them straight, if it doesn't, then leave them. It's up to you.