[aggieben]

It's worth adding, too: aside from the legal liability angle, what about what the invitation to a romantic encounter does to that applicant for the rest of the interview? Now the rest of the interview, from her perspective, is all about that dude's romantic interest in her, and no longer a professional encounter. It's all downhill from there. If she gets hired, how can she possibly work without the pressure of thinking that her job or advancement depends on her response to that guy's advances? If she doesn't get hired, how can she possibly think she was fairly treated?

I don't have an inherent problem with coworkers asking each other out on dates, or within a professional context in general, but doing it in an interview is beyond stupid.