Law of Popular Ships
The dominate type of shipping in a given fandom is directly proportional to the gender balance of the main characters
Examples-My Little Pony: Friendship is Magic: Mane 6 are all girls. Most ponies seen in show are girls. Primary type of ship? Girl/Girl. -Pokemon: Balanced gender ratio. Ships of all types, but most are heterosexual. -Avatar: The Last Airbender: Same as Pokemon, balanced gender ratio, so ships are het.
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