Our eldest is coming up to 10 this year and she started asking questions....I sat her down one day and explained in simiplified terms that she could understand....funny though as a couple of weeks later they had school letters go out to parents that the Sex Education programme was starting etc..... so I am guessing about that age really is the best time when they are nearing 10

they have more understanding of things then and its funny she has taken it very much in her stride and actually turned round to me and said UUUURRRGGHHH I cant believe you and Dad do that how disgusting LOL!!!