I recently had prolonged, tense during my vacation with my wife. We had sex for 5-6 consecutive days, 3-4 hours daily. I noticed on the last day, my penis was not very hard, and even was non-erect after one hour of sex. Did I have too much sex- not enough oxygen. Now its 2 weeks, and I get erect but not very hard-- I cant feel that hard vessel I felt from my rectum to my shaft as before. Help. 47 yrs-5'6"-170 lb male