My wife’s approach is to have the talk early and repeatedly - but with an age appropriate level of detail. Our 8 year old knows that kids come from mama’s belly. He knows what bodies look like (sneaky guy always peeking on us). He also knows that romantic love is a different kind of thing. Unintentionally he also knows the word sexy, which I blame on pop music. I don’t think he knows what it means, at least.

Funny though; once he advised us, unprompted, that “boys have a penis, and girls have hair.” We’re trying to raise him without prudishness or body issues, and with enough knowledge to avoid the mistakes he already seems so likely to make. I’ve never known anyone so impulsive in my life.