The bond between twins is a connection that can not be explained if you weren't born into. Dan tries to understand what that connection between both fraternal and identical twins is like and how it effects their romantic relationships. Dan talks with evolutionary psychologist and author Dr. Nancy Segal about the psychology of being a twin. On an identical twin version of DANswers, we learn if twin's significant others ever get them mixed up and what the worst part of being a twin is. Then Dan has a conversation with his identical and fraternal twin best friends to see how different types of twins are similar.