Note: The G-spot is a zone which contains the
sensory neurons supplied by the vagus nerve
(the tenth cranial nerve or CN X) wandering into
the pelvic cavity outside the spinal cord,
the somatic nerve in the spinal discs (T12 – L2)
and the sacral segments (S2-S4), the
sympathetic nerve in (T12 – L2), and the
parasympathetic nerve in (S2–S4).
Inside the vagina from the G-spot to the fornix
vagina and the cervix, the vagina canal
is predominantly composed of smooth muscle,
where the nervous sensing and control
are dominated by the vagus nerve, the
sympathetic nerve and the parasympathetic
nerve. From the vagial orifice to the G-spot,
the outer vaginal section is predominantly
composite of skeletal muscle, where the
somatic nerve is dominant, with a layer of
smooth muscle around the urethra orifice.
Noticeably, the nervous supply in the smooth
muscle is provided by the vagus nerve,
the sympathetic nervous system, and
parasympathetic nervous system.

Electrifying Orgasm – The mutual enhancement of Qi projection between  the glans penis and the cervix/uterus.

Orgasm is a phenomena of the genital smooth muscle contraction, in conjunction with the pelvic floor muscle contraction, that sends the piezoelectric surges or pulses back to the brain via the vagus nerve, The generated electric current also transmits to the cervix and uterus from the male glans.
In addition to the piezoelectric effect, the penile and prostate smooth muscles and the pelvic floor skeletal muscles also contain some excitable cells which can generate a electric current via the sodium/potassium ATPase (sodium-potassium adenosine triphosphatase, also known as Na+ /K+ pump, sodium-potassium pump ) under stretching and acetylcholine induced depolarization-repolarization cycles. The male orgasm ejaculation contraction can induce the female partner orgasm via the ejaculation-contraction-induced electric current. Women can usually experience extra orgasm via their partners’ ejaculation hot semen (thermal induced Na+ /K+ pump, and prostaglandin E2 induced cervical/uterine contraction) and the ejaculation-contraction-induced electric current. During ejaculation orgasm, the ballooning penis pumps out a electric current like the electric eel. Instead of self defense like the electric eel does, this “electric eel” actually helps men deliver extra pleasure to their partner. This phenomenon is called electrifying orgasm.

Once the woman starts to experience electrifying orgasm, her uterine and cervic contraction will also generate a powerful bioelectricity to intensify the bioelectromagentic field for both the vagina/uterus/cervix  and the glans penis.
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Thus, electrifying orgasm is the ultimate goal of of double cultivation of sexual energy for the Sexual Qigong (ChiKung) intercourse (陰陽調和雙修運功行氣法) with the 3-point excitation method.

The 3-point excitation love position for Double Cultivation with Anal Breathing Qigong
In Sexual QiGong Intercourse with Lotus Stting

The inter-body Qi Circulation can be done by the vagus nervous stimulation between the glans and
cervix/Epicenter, and between the male pubis and female pubis/cliroris; with the mutual deep toungue
peneration kissing that activates the hypoglossal nerve CN-XII and the trigeminal nerve CN-V.

The penile hypersensitivity is due to  a lack of endorphrine and insufficient erection to overcome the excessive prostaglandin E2 and histamine stimulation on the prostate, urethra and penis as described in http://action.love/WordPress/2014/01/22/orgasm-histamine-receptors-h1-h2-and-h3-and-premature-eejaculation/
The penile ballooning effect (http://action.love/WordPress/2014/02/25/theory-of-penile-ballooning-enlargement/ )  will reduce the per-squared-inch  nervous sensors density.
When the penile volume increases 140% in the ballooning stage, the glans surface area increases 120%, and thus the glans nervous sensors density reduces  to 83% (= 1/1.2),
that is 17% reduction in sensitivity.
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Endorphrine released to the bloodstream will also reach the brain to cool down the hypothalamus during sex.
Therefore, a powerful, rock-hard erection can help men to last 30-120 minutes until the prostate, seminal vesicles, bulbourethral glands, urethral and penile tissues fire up prostaglandin E-2 and histamine to induce semen emission and flood the prostate/bulbourethral fluid (known as precum) to clean up the ejaculation duct ( prostate ejaculation path and urethra).
Once the precum leaks out, man, you are about to come.