"...researchers speculated that when a man has sex with a woman who has recently slept with another man, the first man's semen is pulled out with the second man's penis (because it gets caught behind the second man's coronal ridge, which separates the head of the penis from the shaft). This lends meaning to the term "sloppy seconds": Sex the second time around is sloppy, because the semen that is removed ends up, well, making a mess."
this study may also explain the male refractory period
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