It's my guess that most of the guys reading don't need much convincing that pursuing multiple romantic entanglements is definitely the way to go. However I think it's very important for us to examine the reasons why as it will at the very least justify our behavior;)
One of the main things that a person should have in order to become successful and to lead a long and happy life is to have a full trust in himself and his capabilities. Loving yourself enough to know your limitations and your strengths is one of the ingredients in leading a life of contentment.