===>> 1. The Bioelectricity in the Parasympathetic, Sexual Nerves, or "Chi" in the Kidney and Conception Vessels for holding a hard erection, vagina expansion, and lubrication;
===>> 2. Testosterone for sexual drive- women need testosterone too, about 1/20 in the men's body (Ref: The Hormone of Desire by Susan Rako, M.D.);
===>> 3. Good blood/Chi circulations for the deliveries of fuel (nutrition +oxygen) and bioelectricity to the sex organs/engine;
===>> 4. Calming the liver, heart and brain (no sweating and fatigue) to avoid the Sympathetic Nervous System to execute the "Fight or Flight" Command and thus, disable the Parasympathetic, Sexual Nerves that control the engorgement and lubrication of the sex organs.
===>>5. Sexual ChiKong Intercourse to generate the Bioelectricity by intercourse for better engrogement and lubrication of the sex organs and for long-term anti-aging for both sexes, and to tone the sexual muscles.