Back 'scrawping'
I usually use a convienient door edge, but then usually get accused of acting like a cow.
General 'scrawping is most most pleasnat though.
Nowt much werse than an itchy bum crack though, 'specially if you are with company or in a public place.
Can be really agonorious until that golden moment, that time of sheer delight, when you think no one can see and you can get stuck into a fantasticly satisfying scrawping sesh, oh yes.