Open Question: How your mom can find out that you masturbate?

I just came up with a realization that it is pointless for kids to believe that by being super sneaky, they can conceal their habit of masturbating (to porn) from their parents. How? Well, if you didn't masturbate, you'd get wet dreams. And if your mom does the laundry, she can see this. If your clothes are "clean", it can only mean three things: 1) you sleep in the nude (unlikely) 2) you