thank you for asking. Excessive pornography use, excessive masturbation are two major risk factors for erectile dysfunction. it may not cause permanent damage but yes, It can damage ones sexual life. it is important to know and have a formal education about sexual hygiene for healthy sexual life from an expert. With suitable interventions and instructions, both the above mentioned problems can be controlled. Regarding premature problem, a detailed history and workup of complaints is required to establish the diagnosis and it can be treated accordingly.