Double Helix is the situation, commonly referred to as a game, in which two semi-erect men twist their dicks together to form what resembles a DNA Double Helix hence the name "Double Helix."
Greg: Hey John, wanna play double helix?
John: Let's do that! Let's do exactly that!
<game of tummy sticks ensues>
John: Shit! I hate it when I get my Schartz twisted.
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