From what I've read , it's often to do with ' male competition' .
If your wife is attracting attention and has sex with another man, very often the husbands natural reaction is to reclaim whats his .
Without meaning to be too crude, every time another man has had my wife, my first instinct is to have her as soon as possible after the other man .
The easiest way to seek his reaction is to play dumb ...
Ask him if your still sexy, and when he enquiries why your asking, tell him a hot guy started chatting to you at a local store, and even asked you to have a coffee with him .
Make out your confused as to his intentions as us husbands love to think we are full of wisdom so let him explain to you that the guy wanted to get you in bed.... just look surprised that another guy was trying to bed you.
Like us men who plant the idea in our wives heads, you'd be doing exactly the same, and you will see if it turns him on, he may give the impression he's not happy..... but I bet I will be constantly thinking about it.