Spanking children... Girls vs Boys?

Just curious to see people's opinion on spanking children. When I was growing up my sister and I never got spanked, but my brother was spanked hard quite a bit.

My parents felt my sister and I should never be spanked since we were female, but that boys needed a swift spanking to keep in line.

What do you think? Should their be a difference between punishing/disciplining boys and girls?
Children should never be spanked.
Only boys should be spanked. Girls should never be.
Only girls should be spanked. Boys should never be.
Both should be spanked equally.
Other (Please comment).
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Spanking children... Girls vs Boys?
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