There is a sister in my cong that has (or at least had) a tendency to bring up touchy subjects during field service. I know because my wife has told me. When on FS with a group of only women, she would start asking questions like, who do you think is the most handsome at the hall. That was the ice breaker, she would then move on, especially if alone with my wife, and ask if we had oral sex. My wife would tell her we did and did so freely. She then went on to confess that she did but felt terrible about it. That whenever her and her husband fell for the temptation, they did it and then cried out after they were done. She then try to convince my wife that we were doing wrong and told her we really needed to pray about it. My wife did not pay much attention to her and realized that she was a personification of misery looking for company. I feel for them, because no one has a right to make them so miserable.
In our case, we do and talk about anything. While my wife and I disagree on religious matters (we still attend meeting together though), we are open to talk about anything together. We've gambled in Vegas, we've gotten drunk together. Pretty much anything goes. We have a lot of fun together so long we don't discuss the org. Funny how that works, because in actions she is not as hardline as in words.