my ex bf has been having trubel peeing it burns the tip of his penis and he said it didnt start till the day after he wore quarter roy pants he has and the day after is when it started its been going on for five days im clean and my test came back negative so im trying to think of what could be the cause of his pain in the tip of his penis its red and burns bad and it got alittle better when a day ago then went back to the pain then he had chicken soup one day with out coffee and it didnt burn no more so he thinks its the coffee all he drinks is coffee nothing els relly so what is the problem?