Why some people have erectile dsf,weak penis venis, weak sperms weak brain is it because of masturbation or drugs or what?

Impotency: The inability to achieve and maintain an erection sufficient for satisfactory sexual intercourse is a distressing and common symptom affecting up to one third of adult men. The prevalence of erectile dysfunction increases with age and it is common in men with systemically disorder such as hypertension, ischemic heart disease or diabetes mellitus.