Not hard to believe considering the mental state of the parents.
I know of a guy here that the state keeps allowing to adopt young boys. The babysitter for the boys found one sodomizing the other one night. This occurred when the gay adoptive father was out gambling.
Altogether a wholesome environment.
Learned behavior, that’s an almost certainty. Acting out in a sexual manner prior to puberty is a prime indicator for their having been sexually abused themselves.
I haven’t heard about that. Where? How old were the boys?