Hi SensualDeviant,
We're a couple who get hit on often by cheating husbands, and a time or two by cheating wives. We don't go there.
In our profiles, we've added a statement about that. It's polite, and it does cut down the cheating traffic.
Nothing you add to a profile will eliminate all of it, because so many people don't even read the profile.

But if you'd like to cut it down, it does help.
Here is our statement: "We're not looking for cheaters doing this behind a partner's back. We just don't feel comfortable being any part of that."
Good luck!