I have a very small amount of clear discharge from my penis.. I get hiv testing 2 times a year, and have been tested for chlamydia, gonorrhea , syphilis and uti 2 times in the past 2.5 both times neg, and weeks along side treatment for these both times I have been tested. I have no pain when I pee, and my testicles are not sore or swollen and no sores. what could this clear discharge be?