I believe the practice of asking 'intimate questions' was stopped by INZ many years ago due to issues regarding privacy (and rightly so because, in my opinion, those sorts of questions are highly inappropriate and just plain creepy!). As has been mentioned above, the questions will likely be of a general nature about the timeline of your relationship to date and any plans you have together for the future. Keep in mind the 'four-fold test' that INZ is trying to prove or disprove in their assessment of your relationship - credibility (whether statements and evidence are credible), living together (whether a couple are living together at the same address as a couple, not flatmates/friends), genuine (reasons for entering the relationship were genuine and with the intention of being long-term) and stable (likely to endure into the future). The questions are going to cover off these 4 elements.