Getting a dribble after defacating can happen to healthy men too. It is simply a mechanical anomaly of the male anatomy. A firm stool can put pressure on the prostate, causing it to release fluid. I suspect it happens to most men at some point. If you're healthy, you might not even notice it. I get mild POIS symptoms when I have such an emmision. Most notably, an itchy, allergic feeling in the entire crotch.