Would you like to share your wife with me?

"Would you like to share your wife with me?" This is the question I heard yesterday from a bar. My wife and I went out to celebrate our anniversary and then we decided to went to a bar and have some drinks. A guy came to us and talked to us for a bit and then he asked this question. Of course I said no, just for that he used the wrong sentence. My wife and I are one of the swinger couples. We would have threesomes once in a while, but this man is definitely not what we want. I just know it won't be a good memory if we had a threesome with him.