During first dates, I've been utilizing Blackdragon's patented conversation-starter, "When was your last really big relationship?" It's a great question as it gets them talking about topics that transition pretty naturally into sex. However, it has a downside that I don't quite know how to handle. Once they're done telling their story, they'll inevitably ask "How about you, when was your last gf? What happened?"
The truthful answer is, of course, "I'm still with her, we just have an open relationship." But that's obviously not going to go over well. How do I handle this question? It seems especially difficult if I'm going after the girl just as an FB, because then if I just make up a fake answer, it sends the signals that I'm looking for something serious right off the bat.