Actually, I've heard quite the opposite. I can't find it now, but
If your relationship is genuine, then it should be the easiest thing to do. Talking about your relationship? Should be easy as pie. Do you have any specific concerns about what they could ask that would put you in a difficult spot?
I've heard quite the opposite. I can't find it now, but I remember seeing a list of questions and they were something you would want to prepare for.
simple things like "what was the date you first became intimate?" My boyfriend and I met face to face after being friends over the internet for a year. The whole weekend was a mess of feelings and intimacy. there was no way either of us remembers the exact date without going back and looking at a calendar and talking about it. If we had to answer that questions without prep, we likely would not have chosen the same date.
other things that are simple like: favourite color, movie, food.. My boyfriend is picky as hell.. his favourites vary depending on the day and we would have to sit down and talk about which ones we would choose if having to sit through an interview with immigration..