My son is 5 soon to be 6 and is getting curious about girl parts. He has always been curious but is now starting to realize there is something more about girls and boys. It is not just anatomical any longer, but more the sexual urge. He is not "how make babies" but noticing people kissing, etc... I think he also notes a emotical, sexual difference between the sexes. We have started to talk about mom needing privacy and he can have privacy from me and his sister, but he is a very analytical and wants the facts. Any ideas about books or something that I can help him with is curiosity but still be appropriate. Don't want him to think girl and boy parts are anything bad but that we have to respect each others bodies, it's okay to having feeling, etc...
This is coming a lot sooner that I thought it would.