At 6 they are too young too learn everything but that doesn't mean they can't handle some things. Teach them about sexual thing that are age appropriate. At 6 you can teach them thy boys have a penis and girls have a vagina ( a la kindergarten cop) and that it's important to be respectful of other peoples private parts. After a couple of years you could explain how the boy parts and the girl parts are both needed to make babies. Later when they are like 10 you should start talking about puberty since some of them will start seeing changes within the next couple years. At 12 you could possibly start teaching about how exactly the babies are made but it's important to keep it age appropriate. You want to educate them so that early bloomers won't have sex without knowing the dangers and risks of doing so. At 14 you can begin full blown sexual education, teaching about the sexual act as appropriate, answer questions they will undoubtedly have, and teach them about safe sex and birth control. It's important to teach beyond "abstinence only" with sex ed. It's ok to encourage teens at school and home to be abstinent, but if you never teach about birth control then that is a big mistake. This will provide teens who are still going to practice sex with what they need to be at least somewhat responsible with their health and future planning. I think it's unnecessary to be extremely graphic with sex ed (providing details of sexual positions, or non vaginal sexual acts). They will find that out by themselves eventually. Edit: Concerning homosexuality, it's important that teachers inform parents that the parents are the primary educator of children, not teachers, and that teachers work with parents in the teaching process. It's important to maintain separation of church and state, so I believe that schools should inform children what homosexuality is, but offer no opinion on whether it's right or wrong, and leave that to the parents to talk about as a family. The school should advocate that no matter a person's sexuality, it's important to treat everyone with respect and civil rights. The same applies to all sexual partners the children will eventually have as adults. Edit 2: concerning masturbation, I don't see why that needs to be taught in schools. Kids are going to find out by themselves, and due to the nature of masturbation it's probably best that the parent's deal with that as they will. If it MUST be taught in schools the it should be treated the same way as teaching homosexuality, where the school just tells kids about what it is and then doesn't offer an opinion on whether it's right or wrong, and leave that as homework for kids to ask their parents.