La petite fatal, LA petite Mort, or the little death explained:

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When fainting occurs during or immediately after an intense orgasm, the most common medical diagnosis is postcoital syncope (PCS). This is a specific type of situational vasovagal syncope where the body's autonomic nervous system overreacts to the physical or emotional intensity of the moment.

Exaggerated Vagal Response: The vagus nerve, which regulates heart rate and blood pressure, can become overstimulated by the intense physical exertion or emotional rush of an orgasm. This causes a sudden drop in heart rate (bradycardia) and blood pressure, reducing blood flow to the brain and leading to a brief loss of consciousness.

Physical Triggers: In women, deep cervical or pelvic stimulation during intercourse can directly trigger this vagal reflex, as the cervix is densely innervated by the vagus nerve.