opb:
Of course it is possible that everyone is in fact a spanko but that the predisposition to think you are vanilla is the thing that is the aberration, genetic or otherwise.
Well, maybe everyone is by nature a spanko. It's only that the society-induced self-oppression inherited in the system prevents most people from living it out, denying that the desire even exsists?

BashfulBob:
If you have managed to avoid providing any grounds for learned behaviour
Weeeelllll... I have to admit guilty to her probably having seen me smacking her mother's butt a gazillion times...
opb:
Congratulations on having such an obviously spankable bum
Thanks OPB, you make me blush with pride
