Sometimes, after I urinate (usually more than a few days after having sex), a cloudy sticky substance follows the urine out of my penis. There have been a few times that the substance even is released after I put back on my pants and sticks to my boxers. What can this be a symptom of? There is no burning while urinating, or sex, or ejaculation. Or sores on my genitals, or pain in other parts of my lower body.