interesting question, the whole nature/nurture debate is never really answered. I personally would lean towards nurture as if you were born a sub that would imply that there was a submissive gene, and therefore it would be passed down through the generations, there is not a great deal of evidence to support this in my own family.

However i do know that i have leaned towards a submissive nature as far back as i can remember. So the truth is I have no idea! I would be interested in other peoples thoughts