https://www.bartleby.com/278/2.html
It's completely true that four year old boys get erections and play with themselves (I did), don't think about it all when they are ten, and then tend to think about it a lot when they hit puberty.
It is the basis for understanding how sexual abuse hurts children, but say it and people will report you to the FBI as a pedo.
If Graham were serious he could make a list of 20 diverse examples like this.