It has to be his cock. Why do I say that? Well, maybe I think too much, but this is the reason. He showers in the morning, then goes about his business all day getting who knows what on his hands, then every time he pee's he transfers what ever is on his hands(Petrol, food, dirt form the cash machine etc) to his cock. Is there any man in existence who thinks to wash his hands before touching his cock? I think not. This thought has made me think twice about sucking cocks (and sex without a condom for that matter).