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But Leo didn’t know the real cost of his hiding habit. He thought he was just being polite. He didn’t know about the rectal compliance .

That stool collects in the rectum, the final holding chamber. Your rectum has stretch receptors. When it’s about 25% full, they send a signal to your brain: Hey. Might be time to find a bush. That’s the first urge. You can ignore it. The rectum relaxes, the stool slips back up into the colon, and the sensation fades for a while.

The relief was not when he finally sat down. The relief was the permission . The brain had finally released the pelvic floor muscles—the levator ani and the puborectalis—which had been holding a voluntary clamp for five hours. The puborectalis normally kinks the rectum like a bent garden hose to keep things in. When Leo relaxed, that kink straightened.

Leo had a rule: Never poop at work. The stalls were too echoey, the gaps in the doors too wide, and Sandra from accounting always seemed to be reapplying her lipstick at the mirror during his potential window. So he did what any rational, data-driven professional would do: he suppressed it.