I've not gone more 'hardcore'/BDSM, but got the giggles that I had pegs in bedroom. Reason was, that it makes changing duvet on your own easier (Suzee's Homemaking Tip 27 ) If you peg duvet to cover it's easier to put on. I realised, however, that I may not be believed. The use of everyday objects for BDSM/spanking BTW is known as using pervertibles, which amuses me enormously. We have hairbrush, a nasty flyswat and some interestingly shaped kitchen spatulas that count as pervertibles. Not sure if a riding crop counts or not...

For the record those that enjoy pain are into algolagnia
http://en.wikipedia.org/wiki/Algolagnia
May also be masochists
http://en.wikipedia.org/wiki/Masochism

I am far too focussed in my *ahem* specific interests (as is my Cariad!)to be anything but a sub-section of such categories