The OP poses a very difficult question to answer................truly it depends on the hotness of the Mrs........
Just go out and have a good time. I would not worry about being approached. We are not into the LS and it has never been an issue. Actually, the first few times we were approached it was after we went back to the room and compared notes that we realized that the other couple was hitting on us. We are now more aware and when we cool things off it is not an issue. Not into the LS but have swayed a time or two. To be honest, if we go a few days without anyone showing any interest, not just LS but flirting, she is highly disappointed, just not as fun. She doesn't want to be a tease, but we do like to party.
We are considered swayers at TTR. There could be more swayers at TTR than anything else at any given time.