Nurture... I believe anyone can become anything... In the right situation, under the right circumstances... a person can be changed into anything. I also believe that that person can eventually fight against every natural instict they have. Face it, there are skinny people in fat families, there are Democrats coming to the bible belt for Thanksgiving dinner, and there are very successful professionals that commit suicide or turn to crime... I think the Nature argument makes everyone feel good, but like most arguments that make people feel good, doesn't hold much water.