Fear of sex creates unsafe sex

Im referring to the way parents treat it as though you are somehow "not innocent" once you learn about sex.

Why is there an age limit for learning about sex? I feel like it all comes from the religious fear of Masturbation.

Innocence is ignorance here, and id rather children learn safe sexual practices when their brains are better able to fully absorb information.

I saw a mother panicking because her 5yr son walked in and watched without their knowledge, awkward for sure, but its not a big deal unless you make it a big deal.

The comments were discussing when is age appropriate for such knowledge to be given to someone, no one explained why that mattered, they all talked around it as though a consensus was already made and it was simply a matter of which age was best.

What makes it bad for the child to know something at a young age?