Nitric oxide and other enzymes are involved in relaxing the blood vessels in the penis that in turn allows erections and cllmaxs. If you are deficient in any of these you will have problems. If you had a prostrate problem then you would also have urination problems, like feeling that you always have to go. Prostate problems in a 20 years old would be rare. I am also deficient in stomach acid production. This and the l-arginine deficiency date back to my development in the womb. I have had them my whole life. When your blood vessels are constricted, semen can leak out but they are not open enough to allow a full on cllmax. This may be what you are experiencing, i don't know. I am seeing a homepathic 'doctor' who uses muscle testing to run tests. It is called applied kinesiology. There is a forum for it here on curezone. I just started on the homeopathics, so i won't see any results for at least 6 weeks. I am seeing a MD next week and I am going to get a prescription for v1agra or something similar to test it out once. I want to see the effect. I am only 39. Use google to research v1agra and other similar drugs to see how they work and the erectile problems involved. punch in l-arginine, nitric oxide and other things you come across and do more research. You would be suprised what you can find on the net if you keep digging.