“Researchers from Carnegie Mellon University and the International Computer Science Institute built a tool called AdFisher to probe the targeting of ads served up by Google on third-party websites. They found that fake Web users believed by Google to be male job seekers were much more likely than equivalent female job seekers to be shown a pair of ads for high-paying executive jobs when they later visited a news website.”
Advertisers on AdWords CAN limit their ads to show only to males or females, but I can’t imagine why you’d do that with employment ads. Besides just being a stupid idea, can you imagine a corporation being busted for just showing executive ads to men (or just women)? They’d get sued into oblivion.