yep Starsky Zig and I have separate DB coaches and they both encouraged us to seduce our spouses. I didn't really go along with the idea of getting him into bed. But she did suggest that I always dress nice, flirt, have a bit of phsyical touch here and there, give him clear signals that I was not drawing a line, closing a door etc. Her reasoning was that men were very simple creatures they go where they feel good. I needed to make our house where he felt good, make all our interactions feel good ones.
Then he would find that he enjoyed his time at mine more than he did at his place (with his GF)

he didn't have an affair BTW, I left him, we both dated other people, then I had change of heart and wanted to work on the marriage. But he is now living with someone else.