Not sure if this topic has been discussed before, but picture this...
You've been on the run for days even weeks, you stink horrible from god knows what. It is only human nature to want to be clean..so how would you accomplish the task of bathing? In a shower? in a river? in a pool?
Of course it would be a dangerous task, such as being found by stenches, surrounded, dripping wet and naked what are you too do?!
Also the simplest thing as taking a "Dump",...being caught with your pants down and eaten is no good either