When I was 5 I learned what a male organ looked like (I had no brothers) because 2-1/2 year old little Tony from down the street would pull his out when ever and where ever he had “go”.
What this article fails to state is if this is normal preschool curiosity hyperbolized, or if it goes beyond this.
I’d bet that little Tony would be labeled a sexual deviant for taking a leak.
What you say is not unusual.
The real problem with this story is that we really have no idea what happened/ What, precisely, was the “sexual activity”?