My bishop was hardcore on the masturbation interviews. They started at 10 because he wanted to be sure that he could “identify worthiness issues” before we became deacons.
In my interviews, my bishop started with 20-30 minutes of explaining what masturbation was – graphically describing how it could happen without us using our hands, that it could happen clothed, and that touching ourselves down there was never okay, and that it was particularly bad if we ejaculated. He then went on to explain that some boys were using Sears underwear ads and that they were improperly getting aroused from these ads, and proceeded to explain a variety of “inappropriate common sources” for arousal.
He then spent the remainder of the hour-long interview reviewing the various ways of masturbation he had discussed and asking if I had ever done that, and if I had ever been aroused from any of the sources he had discussed. He paused on each one for a yes/no answer.
All of this was in a closed-door session one-on-one with him. For an hour. I distinctly remember feeling like I wanted to run out onto the highway next to the church afterwards and try to get hit by a car.