Originally Posted by MageB420666

It could be urine or it could be something else, I would suggest seeing a doctor about it, especially if it is as off color as to look like the smiley. If it is urine then yes it will kill the sperm. The purpose of precum is to clean out any leftover urine from the penis so as many sperm as possible make it into the female alive. And if it is just a chemical imbalance the only thing I can suggest is a change of diet.