if a child was attempting to initiate sexual contact with me,
i would immediately suspect that child had been previously abused, and i would contact the authorities.
I would assume the same thing in the same situation, especially if it was an older kid. At 4, I'm not sure grabbing an adult's privates necessarily indicates that the child has been sexually abused but it certainly could. If it were a 10 year old, I'd say that type of behavior would more proof-positive of a history of sexual abuse, because a ten year old should know
that it's inappropriate to try to touch an adult that way and that doing so is a sexual act. However, at 4, a child might be doing something like that purely out of innocent curiosity and out of genuinely not knowing any better. For someone to turn something like that into a sexual interaction with a 4 year old child, then for that person to claim the child was "initiating sex", is not only sick and evil, it's fucking idiotic. Sadly, this guy is probably so twisted and diluted with his own bullshit that he honestly believes that is what happened and that the sexual encounter was "consensual". Throw away the fucking key. Peace.