Myths of female innocence perpetuated by misogynists and feminists alike are simply an outgrowth of patriarchal ideology that positions women as perpetually pure, innocent, and childlike and if not then corrupted from that state.
This is a justification for the patriarchal racket that makes men the de facto guardians and custodians of women.
The concept that women need to be protected from corrupting influences is not at all radical.