Original: Causal factors of child sex offenders are not known conclusively. The experience of sexual abuse as a child was previously thought to be a strong risk factor, but research does not show a causal relationship, as the vast majority of sexually abused children do not grow up to be adult offenders, nor do the majority of adult offenders report childhood sexual abuse.
Simplified: Men are the offenders in most child sexual abuse; women are the offenders in around 10% of the cases.