Sex less Marriage, would you stay or go?

This is a difficult topic for me, and really embarrassing. My husband and I have been married for about 6 years. He is really overweight and the weight causes fissures on his manhood which make it impossible for him to have sex (it's extremely painful) it has been almost 2 years since we have had sex. I love him and we are great together in every other aspect of life. But this no sex thing is really affecting our marriage. I want children, the fact that he can't preform really drives a big wedge between us. I am thinking about leaving him. I don't want to but I also can't live like this anymore....any advice ?