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artofmalemasturbation:

No. 20 in Set, Celebrating the Beauty of Male Physiology: At orgasm the testicles tend to rise closely to the base of the penis in its fully erect, “tumescent” state.  After the enormously pleasurable, often explosive feelings as we ejaculate at orgasm, we usually experience a pleasurable afterglow—great relaxation sometimes leading to sleep or a quick “nap” as “detumescence” sets in, the penis becoming flaccid and the testicles gradually dropping to their usual place of rest within the scrotum.

“Tumescence is the quality or state of being tumescent or swollen. Tumescence usually refers to the normal engorgement with blood (vascular congestion) of the erectile tissues, marking sexual excitation and possible readiness for sexual activity….  Detumescence is the reversal of this process, by which blood leaves the erectile tissue, returning to the flaccid state.”

Source: http://en.wikipedia.org/wiki/Tumescence

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