What Causes Erectile Dysfunction Along With Reduced Penile Size?

Hi sir , I am 36 yesold and unmarried I found that I ve premature ejuculation like some times it releases for just 2or 3 strokes and iI veregular hand practice and my penis size is 6 inches and average am getting marriedsoon can you help me to over come of this problem and I watch porn regularly and Ismoke regularly please help me to get out of this problem by way of medicine