@I Read Everything Lies turn innocence into ignorance and ruins trust. It's not hard to share the truth in a non-explicit way.
'When a mature male and female share a special experience, a baby can be made. The rest is something we can talk about when you're [--] older.'
The benefit of the truth goes beyond establishing a firm foundation of trust. It also opens the door to arming a child with knowledge to protect them from dangers in a more comprehensive way.