Here is some snipets from a spanking article from the Village Voice.

For some, a back-end batting goes along with fantasy role-playing—naughty schoolgirls and unruly boys disciplined at the hands of a cruel teacher, a stern governess, or an unforgiving nun.

and

But not all spankers and spankees consider themselves kinky. Interestingly, some rosy-cheeked lovers see themselves as completely separate and wholly different from the whips-and-chaps crowd. Spanking is an erotic activity, foreplay with no further implications, no power exchange, no childhood re-enactment; in other words, the act itself needs no knee socks or dominatrix boots to get participants off. Instead, these folks—commonly known as the OTK set (that’s Over the Knee)—describe themselves as adults who enjoy spanking or being spanked by other grown-ups.

Check out the full article here.