Quoted: The ratcheting up of this by making objects or people sexy that usually aren’t or shouldn’t be, like the sexy Ebola nurse is perhaps a way to differentiate ourselves now that va-va-voom costumes are the norm, says Markus Brauer, a psychology professor at the University of Wisconsin-Madison, an expert in human social behavior. After all, no one wants to be the third sexy cop at a party. We want to be sexy and stand out.