Spanking/corporal punishment is linked to increased agressiveness and anxiety among those spanked -though such effects are somewhat decreased when the community/society surrounding the child views such as acceptable (I just read that). Also, "spanking" can range from something to gain attention in an emergency situation (which does not actually cause pain -such as the above example), to an outright ***whoopin'. The reason for -and severity of -the spank are also factors.
Some say you shouldn't spank in anger, but if people were honest with themselves, they probably wouldn't be thinking of spanking unless they were angry.
My dad had a booming voice which would scare the whoosiwhatsits out of me and stop me in my tracks in case of emergencies -or profoundly stupid behaviors (I wasn't the brightest kid -a definite paste-eater).
Later in life, he would just raise an eyebrow, look at me with a disgust-distorted face and say.. "What'na hell were you thinking?" This was simple, yet very effective.. and he also explained the error of my ways.
I got a good 'pankin if I was mean to someone, or if the consequences of the action were dire (but my mom would often intervene, take me out of sight and only pretend to spank me). Maybe it wasn't perfect, but it was effective enough to prevent extreme stupidity.
I don't believe spanking/corporal punishment is necessary -discipline and instruction are necessary, but need not include physical contact.
Many take some bible verses to support corporal punishment, but this is not the actual case. The "rod" spoken of in the bible -as it relates to children -is not a whoopin' stick -it is reproof/instruction.
Pro 22:15 Foolishness is bound in the heart of a child; but the rod of correction shall drive it far from him.
Pro 23:13 Withhold not correction from the child: for if thou beatest him with the rod, he shall not die.
The above is translated in such a manner as to seemingly condone bludgeoning your child, but "striking" (not beating) with the "rod" is analogous to a shepherd using a stick to turn sheep with a light tap -not to hit them.
Col 3:21 Fathers, provoke not your children to anger, lest they be discouraged.