I always imagined I'd be a 'straight up and down' person with regards my children's anatomy, and sex education, but I'm a bit stumped.
DD1 (5.9) has SN (goes to Special School). Her 'profile' is very complex. She can sometimes have startling clarity about something [for example "that's language, isn't it Mum?" when talking about why some children speak and others don't], but in other areas is very behind, and her sister who is 2.6 is more developed.
Today, she said 'what's this bit down here that moves around?' It was her clitoral hood. Now, I said "It's a clitorus". But then she said 'what's that?'
Now, here's the problem. I don't think for one minute she is ready to understand the concept of sexual intercourse, nor do I think it is appropriate for her to be told at this stage that it arouses a woman. At the same time, it has no other practical function.
In the end I went for 'It's part of what makes you a lady.'