I've been masturbating since I was 13. Now I'm 21. I used to have much pleasure in masturbating. But Nowadays I don't find the same pleasure I used to have once and also I feel like I'm losing sex appetite along with sex power. Is it a sign of impotence? Am I becoming an impotent? Btw, when I was on my teen age, I masturbated almost everyday then it lessened to 4 days in a week, then 3 days in a week, after then 2 days, NOW its only once in 3 weeks! I'm getting a little bit of worried about my sex life. P.S: I'm still a virgin guy.