I had a vasectomy over 12 years ago. I have had many problems trying to keep an erection when it is needed most. I can get it up at times but can not keep an erection during intercourse. Could this have any affect on circulation to the penis? I am only about 5.5 inches when fully erect and definitely would like to have more to work with. Will PE still work for me, And if so what would you suggest? I am 40 years old and would really like to enjoy sex to the end not loose an erection in the middle of intercourse. I am a smoker and I know that I need to quit but it is not easy.