Ah, thread, you do make me chuckle.....
Passion has to be there. I don't mind if it's about their job, that's one of mine (want to discuss the link between oral sex and throat cancer, anyone?), and the wider NHS.
Too go back to the previous discussion about children and the childless, by the way, I don't have children and don't mind dating someone with or without them. Mr 3DD (who has lots) says that a woman not having them wouldn't put him off, but his profile says he imagines a date would have them too. There doesn't seem to be a hard and fast rule, really, and even if someone says they want a certain attribute, it doesn't necessarily mean it's a deal breaker. Though it might be.
Am too chilled for my own good this evening, having had some good non-dating related news today. I love everyone. Mwah.