" But in any case, validity, offender self-reports have dubious validity, especially when the offender's self-interest is at stake. The only rule for deception in sex offenders I have ever found is this: If it is in the offender's best interests to lie, and if he can do it and not get caught, he will lie.

Being victimized as a child has become a ready excuse for perpetrating child molestation. The offender who claims he himself was victimized gets seen as less of a "monster" than one who wasn't a victim, and he gains much more empathy and support. It is hard to trust self-reports of sex offenders about abuse in their past when such reports are in their best interest.
Only a few studies on this topic have used objective measures, and they have found very different results.[102] "

― Anna C. Salter , Predators: Pedophiles, Rapists, and Other Sex Offenders