Way too many questions left unanswered in your statement - STDs? Age? Diet? Circumcised? Infections?
I'm probably not the right person to be answering this question, but, if a woman were asking a similar question, and she were healthy in every other way, I would be suggesting she get more of the right kind of fats in her diet, especially wheatgerm oil. To prevent tears, cracks and other irritations during pregnancy and birth - I often suggest rubbing olive oil into the area. In the past, I have also suggested making sure you are wearing natural fabrics that can breathe - might also want to consider not wearing anything next to the skin, especially at night when the skin can dry out and get some fresh oxygen - some sun-bathing wouldn't hurt either.
This probably isn't the answer you were looking for, but might give you something to think about.