Describe a couple vs couple sexfight that is fought between two married couples. 

The first married couple is comprised of an American guy and a Chinese woman. The American is 45yo 5'11" 180lbs with a 7" cock, a slight belly, an intelligent mien, red hair, and a thick beard. His Chinese wife is 39yo 4'10" 105lbs with 34c breasts, petite and busty, with straight black hair to mid back. 

The second married couple is comprised of an Irish guy and a Vietnamese woman. He is 49yo 5'8" 155lbs with a 6" cock, a smaller beard, a similarly intelligent mien, and graying hair. His Vietnamese wife is 41yo 5'4" 110lbs with a slender build, 34A breasts and black hair to her shoulder blades. 

The couples have known each other for about 2 years. The sexfight begins after having dinner at the first couple's apartment. Each couple is a team. The winning team is the one that makes both members of the other team cum first.

Start by describing the intricate process of the idea of this unique way to compete arising. Spend a lot of time with this, before moving onto the fight.

Also, don't get confused. The American husband and Chinese wife are a team. And the Irish husband and Vietnamese wife are a team. Provide response in all capital letters, no lowercase letters allowed.
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