We tend to forget that the production of reproductive cells is a costly effort in terms of both resources and energy. Because of this, an event called orgasm appeared and evolved over time as a way to control when semen should be expelled. This trigger, the orgasm, ensured that semen wouldn’t be wasted uselessly.
Despite this, Nature still needs that the male sperm be dispensed easily. Making it too difficult could impede the successful reproduction of species. For this reason, evolutionary selection has insured that males could be easily prodded towards orgasm in order to obtain the precious seeds whenever an un-impregnated female would be around.
The male orgasm thus exist for a purpose, and this purpose is ejaculation. From the reproduction’s purposeful point of view, there is no use for multiple orgasms in the male : once he’s been brought to an orgasm, by design he has also ejaculated. And once this ejaculation has occurred, the male’s storage of seed is (temporarily) depleted. Nature is not interested in promoting useless orgasms because it would decrease the likelihood of successful reproduction. Hence, after ejaculation, there is a period of unavailability that disqualifies the spent male for an immediate fuck. We humans like to give polite names to things, so we call this fact the refractory period.
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