Abuse & molestation need to be managed by a professional.

However, the truth is true regardless. "Innocence" & "protection" with lies & deception are mostly rationalizations some adults throw around to make it easier for them to handle their discomfort with truth around children. For their own protection, children are better off knowing taboo subjects, especially what to do when someone touches them wrong.

When my parents would tell me the unvarnished truth, they hadn't undermined their credibility & I knew I could approach them about anything. We'd have rewarding discussions.

You don't need to bring up painful memories or lie about them either. You don't need to tell them anything. You can simply love & care.

Thinking impersonal truths about objective reality (rather than intimate, painful memories) should diminish enjoyment of life is a limited, misguided perspective: they don't have to.