Buttercup - I spanked my daughter ONCE during her younger years: ONCE. IIRC, she was 3 years old. It indeed HURT...me. Future punishment was 'time out' in a corner, which she absolutely HATED...MORE than the spanking. She was THE BEST kid a parent/teacher could ever hope for. She is now mother to my grandson.
Me? I received spankings, whippings, etc...ALL FOR GOOD REASON. I even had my ears boxed by my dad a couple of times. Again, all deserved. Sometimes I was paddled, spanked, whipped, etc 3-4X for the one incident.
As a teacher I paddled numerous students: all for good reasons. BUT....I honestly believe that there is an AGE LIMIT at which corporal punishment ceases to work and other measures should be selected. But to say it is ALL bad ALL the time shows a gross misunderstanding of child psychology.