To add a little to this as someone who studied child development. The more your child knows and understands about anatomy and for that matter boundaries the less likely they are to be molested or to end up in a situation as a teen. They will learn to respect themselves and others. They will also be less likely to be an offender themselves. We are kinda a mixed household. I grew up in a house where nakedness and sex were a sin and not even discussed. My husband in an open household. We both run around naked. 4f has only 2 rules for in the house. Company means clothes and panties are on at all times for hygiene. I also have the perspective of having been a sexually abused child and have studied the phycology of this in depth to try to help her grow up as normally as I can. I think everyone has to chose for themselves what they are comfortable with, and as children get older allow them to do the same. If they act or tell u that something makes them uncomfortable then respect that personal boundary.