Aristotle

When men lie together in lust, it is a surrender to the passions... and does nothing for the excellence in us. Nor does any other excess, Cassander, jealousy among them. But when men lie together... and knowledge and virtue are passed between them... that is pure and excellent. When they compete to bring out the good, the best in each other... this is the love between men that can build a city-state... and lift us from our frog pond.