People like the feeling of butterflies in their stomach because life is not enough for human beings – they want to be something more. Some think money, conquest, or shopping will get them there; others think it is knowledge or love. These are all different ways in which people try to enhance themselves. There is a constant longing to expand in human life. No matter how much you have grown, still there is a longing for more.
When this longing to include or expand finds physical expression, we call it sexuality. When it finds emotional expression, we call it love. When it finds psychological expression, we call it conquest, ambition, greed, or shopping. When it finds conscious expression, we call it spiritual process or Yoga.