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1.
The flesh threshold is the point at which a friendship becomes a hazy, undefined awkward mess filled with hook-ups and unanswered texts. After one crosses the flesh threshold, it is difficult if not impossible to return to the previous state of friendship.

Note: Sex is not required to cross the flesh threshold.
We can't invite Ryan and Rebecca to the same party - they're so awkward since they crossed the flesh threshold.
by Babymaker 5000 January 09, 2012