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.