It usually surprises people the first time it happens. You’re in the middle of an argument. Not a light disagreement, but something with weight. Voices slightly tense. Words chosen more carefully, or sometimes not carefully at all. There’s emotion in the room. Real emotion. And then, somewhere in the middle of it, your body reacts. Not just tension. Not just adrenaline. Arousal. It feels out of place. Almost inappropriate. For a moment, it can even make you question yourself.