For all children, and perhaps especially boys, bottoms are a source of endless mirth and amusement. So maybe it’s not so surprising that this leads to a spanking fetish in later life.
I was brought up in the early 1990s, when corporal punishment was really going out of fashion. My sister Fiona (two years older than me) and I were very rarely smacked – really, just the very occasional brief slap when we were very young, and so we didn’t really remember those. However, there was one time when I got a very traditional, thoroughly smacked bottom off my mum.