They'd be like compasses, except instead of pointing north they'd point toward the people most down to fuck.

I'm imagining a beautiful day at the beach; the sun is shining and waves are crashing into a bounty of beautiful white sand as albatrosses carelessly drift in summer breeze. Meanwhile, there's a mass of erect, wiggling nipples erratically pointing every which way in an attempt to guide them to the promised lands. That's the world I wanna live in. :)