I'd be a fan of a human-urinal themed line-up of heads. Have a line up of urinals with head size holes drilled in them and have bitches kneeling with their heads through the hole ... and guys can just casually walk by, use and abuse the head and wet mouth as they see fit, probably piss on it once they're done and casually leave. The camera then zooms in on the whores' glazed face and empty, confused look to end the shot.