My wife hates it when I look at other women. I do anyway. So much, in fact, it leads to a near daily argument. One particular argument she compared my habit to shopping for tomatoes. 

"Say you have a recipe, and you need a tomato. You go to the grocery store and you get to the tomatoes and you look for the perfect one. You look for 10 minutes for the perfect tomato and you find it. Then, after you finish the rest of your shopping, you go back to the tomatoes. Is that not insane, you already have the perfect tomato. Why do you go back to the tomatoes!?"

I didn't really understand the metaphore, so I replied "I go back to the tomatoes because I might want to bring another one home with me." She slapped me and I slept on the couch for two nights.