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My best advice would be to go and see a doctor. You have to exclude physical problems in your dick (which, btw doesn't have muscles inside it, so...
Are you PMOing without an erection? DO you have woods or spontaneous erections?
To see a doctor should be your first step. Also, do you do physical activity?
I never ever thought that I will be cured magically after 90 days. But my sensation now is that I'm missing something. I don't know. As you can...