Nurture or nature?

What has created this anal fetish in me? I love and live for everything anal. Playing with my wife's ass; her playing with mine; me playing with mine, it doesn't matter how or what I do, I have to have it. I prefer anal porn over anything else.

I read about many people here who grew up in households where enemas were a part of life, or where some kind of anal play early in life has led to a life of anal adventure. For me, I having no memories of enemas, rectal thermometers, or suppositories as a child. I do remember my mom talking about the enema practice that she had to do to be ready for a nursing exam, but otherwise all I know is that when puberty hit hard, I started to play with my ass and became fascinated with anal.

What caused you to be the way you are? Was it the way your brought up or do you think, like me that it is just part of who you are?