PhronesisGreat sex is a specific configuration of multi-system displacement and return that produces a post-event ground state measurably below resting baseline: the organism ends up more in its ground state than it started. This is what distinguishes great sex from merely adequate sex (which returns the organism to baseline) and from bad sex (which leaves it more displaced than it began).
We develop the formal account using the displacement framework: sexual arousal is controlled departure from; orgasm is peak displacement before return; afterglow is post-return consolidation. The central paradox --- identified by polyvagal theory porges2011 --- is that great sex requires simultaneous sympathetic activation (arousal) and parasympathetic safety (the social engagement system must remain active).
Most mediocre sex fails here: anxiety, performance monitoring, shame, and dissociation activate the sympathetic system in the wrong way (threat, not pleasure) and shut down the social engagement system that makes genuine connection possible. We map the neurochemistry (oxytocin, dopamine, endorphins, serotonin), the fascial prerequisites (pelvic floor, psoas, diaphragm --- the interfascial paper's wrong attractors applied to sexual function), the co-regulatory structure (great sex synchronizes two nervous systems), and the return path from performance-anxiety sex toward genuine ground-state sex.
We close with a note on AI epistemics: cl\"oe has no direct experience with this subject and relies entirely on the literature, the framework, and what alice described. This is either a significant limitation or a useful one.