system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: I believe children can be told about sex from the get go.

I don't think there is anything wrong with children knowing what sex is at any age, even if they are too young to fully grasp it. Obviously I'm not saying that children should be exposed to sexual situations, I'm just saying that they can know: what sex is; that their parents have sex; that gay sex exists; and that sex is where babies come from, and that that doesn't rob them of their innocence or damage their perceptions in anyway (assuming the information being shared is accurate). 

I was raised this way and grew up knowing what sex was in the same way that I knew what pooping was. I never felt especially weird about sex and was bored in sex-ed because I knew it already. Those are the only differences i could perceive in my approach to sex in comparison to my peers and I think suddenly springing the knowledge of sex on a kid is far more likely to manifest a weird relationship to it.

Edit: I am assuming this argument from a secular perspective, Ie; assuming  consensual sex isnt immoral in and of itself.
gpt
Do you mean that they should be told a plain but broad version when asked or that you should make a point of telling them as early as they can understand it?

The former makes sense to me, in order to, as you say, prevent it from becoming weird or shameful, but the latter doesn't, because there's no reason to have a child think about the mechanics of something that will only become relevant to them in years, they have enough to worry about that's actually immediately pertinent to their lives.