Ok science is complicated, but a part of what happens in males that there is a release of hormones like prolactin and Oxytocin that both temporarily reduce sexual interest, and cause relaxation. ( about 1 in a 1000 males don’t do this and are able to have multiple orgasms). This is called the refractory period.
Women have a different release of hormones that don’t cause this. But it’s really not well studied.
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