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These are the simple rules followed by all open-minded pantieless girls and wives.
Making like they're making love just can't be comfortable—and neither can laying there nearly naked in front of a huge crew while pretending to be either in the mood for love for in the throes of erotic passion.
But while Jim could somewhat justify his actions, Jason Biggs had to be the guy to bring that scene to life, and he understandably broke into laugher just before he had to film what would wind up being the most famous and infamous scene of his entire career.