I think it's related to the idea that if you take a condom along you must have decided the girl was a slut, and no girl will sleep with a guy who thinks she's a slut.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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