This has been going on for over 2 years. My manhood keeps rising and falling when i want to make love. I struggle to keep it up and eventually make love. Everytime i want to make love, it stands for a while and the go flaccid and sometimes it just wont stand again . As a man i should get excited even by just hearing my girls voice but in my case its different. I used to be active in university but now am just 28 and this is happening. Pls note i have neva had std and my sperm analysis shows my sperm count is ok. What do i do?