I'm not a psychologist, but if i was this would be d advice i'd give to couples to help counter infidelity in marriage.
Truth be told, infidelity occurs in marriage mainly because of couples getting fed up of seeing each other.
Make or Buy facemasks (those types you would wear and resemble a different person), about 3 or so and give 'em different names (johnny, luca, spencer) or (genny, sandra, lucia) - These all sound like flirtatious names!
You could wear these masks from time to time when ever you feel like making love to some one "other" than your husband or wife. That way everyone is happy.

no be crase u de crase so!

Combat it fast.

@poster
as much as you might have a point, people do also get tired of the same daily sex routine so if the person had a different face (mask) but did exactly the same thing in bed then the problem would still be there.
as much as putting a mask on, they would have to have a different mind attached to it.