To unattached people, all things equal, are more attractive than attached people The research cost to pursue a person already in a relationship is usually large, because they are usually spending their free time with their current lover allowing less time for you to see them. You will probably have to spend a lot of resources trying to keep the affair a secret. Also, maintenance cost of a relationship with a committed person is also large. Their lover may cause you harm or even kill you if you are caught. |