Continuing the discussion from An almost linear relationship between how much money a man makes and how likely he is to be unfaithful to his wife:
In addition, one of the most meaningful experiences a woman has in her life is when she gives birth. Men never experience that. The closest men come to giving birth (and the meaning associated with reproduction), is sex. After sex men usually feel pretty good about it – their self-esteem is generally increased and they rarely experience “post-copulatory regret.” The song " I Just Had Sex " by The Lonely Planet exemplifies this post-copulatory male elation.