In my limited experience with it, spanking has never failed to put me in the mood, whether it is for discipline or just for fun. I think it makes for great sex, but not necessarily better.
tiptopper:
Although many women would not want to be spanked by their actual father even those women often get turned on by being spanked by a father figure.
Maybe SOME of those women do, but I can honestly say that, for me, being spanked by any sort of father figure would be a turn off rather than a turn on.