It turns out that flirting makes you more loyal -- at least in a business sense.
A professor at Harvard Business School found that exposure to a new brand actually made the customer more committed to their original favorite brand
For example, the researchers asked people who were die hard Coca-Cola drinkers to name some good qualities of Pepsi, and vice versa.
In both cases, doing so made the customers return more fiercely to their preferred soda pop.
Maybe just don't try this on your spouse.