You're already on the right track for my tastes: anal and piss. I like pretty bare feet too, but probably because I was raised in a strip club where my mom and all her sexy friends never wore anything but acrylic stilettos and I grew up longing for the caress of soft toes on my sweet little...face instead of a sharp stiletto up my ass.
Ok, so I have no idea why I am wired this way. But my plug fits pretty well in WSX's socket.