Her reasons for the belief I don't agree with but I do agree that you can curse yourself with what you masturbate to. You can cast a spell on yourself if you're sitting there masturbating thinking about plowing your sister-in-law for example.
If you masturbate thinking about your aunt your mother-in-law your married coworker, this action can create like a placeholder fantasy in your mind that you may try to make come true. Binding arousal to an individual. That time would probably be better spent masturbating on your actual spouse partner girlfriend etc
