Hello dear, The size of penis is genetically determined and it does not increase after a certain limit. But one thing should be known that the size of penis does not determine the potency of an individual. Regarding the problem of Erectile dysfunction, it is due to decreased blood supply to the penis. Though medications like Cialis & Viagra increase blood flow to penis & maintains erection, it can be improved by having a diet rich in fruits, vegetables, fish, nuts & honey. Connections between erectile dysfunction & excess use of porn has been reported in many studies. For those affected, recovery takes place by 6-12 weeks & mainly involves avoiding the causative factor, that is watching porn. Avoid stress...practice meditation. Avoid smoking & alcohol. Despite these measures, if you experience difficulty, it will be better to rule out other causes like high blood pressure, blood sugar and other local causes that impair blood flow to the genital organ. Wishing you a Healthy Life. Take care.