My penis go's soft very quickly as soon as i start intercourse. ;m 38 and never had problems before. i don't drink alcohol now and haven't for 2 years?

Many causes.: You have erectile dysfunction. A large percentage of men have same. The most common cause is medications, such as calcium channel blockers, beta blockers, some anti-depressants, and others. Anatomic causes are fairly rare at your age but possible. See your PCP; he may try one of the anti ER meds such as viagra, and/or refer you to Urology for determination of cause.