I was not aware that the gargoyles were initially used as water pipes and they came in "packs".  I thought it was very clever to view them like that.  It's incredible how architectural style was brought about afterwards.  I believe its essential for preservation, because of the unique way of "guarding" the cathedrals and providing a very effective look into gothic masterpieces during the time.  

You noted that some gargoyles placed acknowledgement of unethical behavior like that of sex as it was viewed sinful among society.  Are there modern gargoyles existing today that have their genitalia exposed to the public who have the same purpose or message to the audience?