Hey Kristen!
My son is 7, soon to turn 8. His

have started to talk about that stuff (they have no clue what they are talking about - just picking stuff up from TV and blurting it out), so we decided to have the talk with last week. I thought it was going to be more awkward than it was, but it went really well.
We stressed he is not to talk to his

about his new found knowledge, that there is nothing wrong with sex - just that their parents should be the ones to tell them.
I thought it better for him to hear the correct info from us, than to keep hearing the wrong info from others. I think they have more of an interest in it, when they think it is taboo or wrong to talk about...
It really depends on the child though...
Hugs,
Elena