As the title says, I have no virtually no sex drive. I never, ever get horny any more. I can get decently hard watching porn, but only with constant stimulation - if I stop touching myself for 5 seconds, I'm soft again. I used to be feverishly horny every day since I was 12, up until 4 months ago, which is when my libido started to gradually disappear completely.

I'm 18 years old. I don't smoke, drink or do any other drugs. I eat healthy, and I'm in good shape. I play music and hang out with friends a whole lot. Nothing in my life has really changed over the past year.

The condition is driving me crazy - I loved my sex drive, as it made me feel alive in a way that I currently don't. I used to have morning wood every day, and random, often rock-hard erections throughout. Masturbating used to feel like heaven. When I touch myself now, I feel nothing.

Please, share your knowledge. I am quite clueless as to what might be causing this.

(Also, why is there no message icon in the shape of a penis? Now I'll have to settle for an arrow, as it is, at least, a phallic symbol - but not satisfyingly so. Admins, get on it!)