I believe like all other knowledge, it has to come in layers. We don't just teach our children about reproduction and human anatomy one time. My child started asking questions at about 8 years of age and that about the time the "first crush" came. All other body changes I saw were indicative that puberty was on its way and the bigger subjects had to be approached, but gently.
Parents need to be aware and learn to have regular conversations with their kids from the start, not just shout when they do something wrong yet the parent never taught them anything....
A child actually does have to know about sex, how it works, what it is for and all the stuff that makes many of us uncomfortable to talk about. The issue is that many adults have a very unhealthy view about sex to begin with, for example, that it is somehow dirty. If they feel this way about it, the chances of them passing on anything other than "No zina, haraam!" is slim to none.
What we should achieve as parents is clarity with our children and we should eliminate the curiosity that drives so many to zina and pronography.
I consider myself to be quite liberal in my thinking and I'm open to any subject really as long as there is an educational purpose and not for idle talk of course. However, even for me, the sex talk was just too much. I couldn't even bring up simple puberty, let alone intercourse and body parts and all that. I found it quite surprising to be honest, I didn't expect to be this way, but when its your own kid.... it isn't easy.
What I did was get a book that I approved of which was age appropriate and allowed the book to guide us and welcomed any questions to come from it. It didn't cover puberty as much as it did reproduction, pregnancy, birth and all that, but after getting over that initial hurdle, I was able to cover body changes and grooming on my own lol. :shade:
My child knows more than I did at that age and that is actually empowering and wonderful to see. Alhamdullilah, there is no more curiosity, not a single question has been asked for well over 2 years now and the human body and its functions are just a matter of fact. No hush hush, no feelings of shame and insha'Allah no curiosity driven desires in the future. I hope that by being open and honest from the start, my children will come to me when sexual urgencies and desires happen (because they happen to everyone) and I can once again, cover the subject in a more profound manner. Knowledge always comes in layers.
I wish my parents were more active in teaching me. Alhamdullilah my sex education experience wasn't horrific. They just spoke about female reproduction and pregnancy. Nothing else. It clearly wasn't enough though.
My point is, yes, parents need to take the lead and not rely on institutions to teach their kids. I like the idea of assigning a trusted person for the parents who just simply can't bring themselves to tackle the subjects. I would probably volunteer for that position when I'm older, insha'Allah. Kids deserve to have questions answered without having to resort to questionable sources.