Science
Why do males have to wait for ’round 2′? The reason may be different from what we think – EurekAlert
New study refutes dominant theory claiming the hormone prolactin induces the male post-ejaculatory refractory period.

If you type into a search engine – “why do men have to wait before having sex again?” – you will very quickly come across Prolactin. This little hormone is thought to be involved in hundreds of physiological processes in the body. Among them is the male post-ejaculatory refractory period. This period begins when a male ejaculates and ends when he recovers his sexual capacity.
If you search a bit more, you’ll see that this theory has even led to the development of so called “treatments”. These promise…
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