wow. Makes me giggle just looking at it. (and maybe even squirm a little. it's surprising how many people overlook the hips as a tickle area, but I've always found it to be one of, if not the, most ticklish areas!
Next time you're near Seattle, we must and without haste get your hips to our studio. Naturally a proper, empirical study is in order. With fingers and feathers we will force just a bit of laughter from you then notify you of the results. All in the name of science, naturally.