[Whit]

      Eh, actually in my earlier example I inflicted minor pain, mostly shock really, in order to avoid major pain and blood loss. A lot of discipline is targeted that direction.
      Also, a slap on the ass works really well with kids to young to lecture. By the time my kids could properly stand they had been taught what they were allowed to touch. I never actually hurt them, but a couple of well timed swats to the diaper made the point well.
      Which brings up another point. You don't have to hurt them when you spank them. Like Brig suggested earlier, just knowing it's a swat, not a pat, will often cause the desired effect, without a really difference in force used.