Aside from the typical attributes such as attractiveness, respect, cleanliness, etc, my wife looks for obviously successful professionals who are clearly able to provide, are healthy and virile. Alphas who show respect and emotional intelligence.
For me this is threatening which drives the anxiety to significantly high levels, all of which heightens the experience.
Fortunately, our relationship is built on a solid foundation of transparency and honesty and we have explored the psychological background that drives her desire.
Her appearance (Slim, Blonde, Blue Eyes, Tall, Educated) means that she can pretty much have anyone she wants, and I have regularly supported her in attending and scouting locations, where such males frequent.