I know I look at other women and find them attractive, and I most certainly know my wife does/did

.....the point being that if your wife does not find anyone else attractive I would buy her a pair of glasses, she obviously needs them
One way to find out is ask one of her girlfriends, women (& men) talk about this all the time to each other and then go home and say "I only have eyes for you" sheesh what a load!
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Never try to teach a pig to sing; it wastes your time and it annoys the pig
I've got to admit it's getting better, it's getting better all the time