Of course he knows you masturbate. 100% of men and 60% of women do it.He's probably contemplating whether or not to ask you when the last time was that you masturbated, and if he's old enough, he may call it self abuse one self pollution.
I don't know...does he really know? I mean, if you're a fully committed Mormon, you think that the upstanding members in leadership positions and carrying temple recommends are sexually "pure." Right?I mean, I always did. But then I didn't last long in the church as an adult, so maybe adults don't have the same naive understanding.