I've been spanked with a wooden paddle by my wife. She finds it distasteful, though. The last time she threatened to spank me I said, "Hah! Empty threats! I know you won't do it; you told me you hate that." (She demanded I take off my clothes and bring her chair and paddle. I received a vigorous OTK spanking, in the nude.)
When I was a kid, younger than 10 (as I recall), spanking me with a ruler was my parents maximum punishment... it only happened on a few rare occasions. My mother's maximum threat, which I remember only on one occasion, was: "Your father will give you a spanking when he gets home!" (But he didn't. By then, things seemed to have cooled down.)