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WHY DOES ORGASM IMMEDIATELY END SEXUAL DESIRE IN MEN

This happens because of evolutionary effect.Evolutionary,It is to increase chances of having baby.

Usually after ejaculation penis deflates within 1 minute of duration to half of its size of pre ejaculation state.Anywhere between 30 minutes to 24 hours, [most] men are rendered temporarily impotent.

However this happens to prevent displacement of sperms in the vagina. If a man continues to engage in intercourse after ejaculation it can displace the sperms already placed in the vagina due to pressure effect of the intercourse.

Women do not drop their desire after ejaculation, because they are evolutionary tuned to have babys whatever way. if she orgasms first, she needs to stay interested until the man is done in order for there to be a chance of pregnancy. 

There is an another hormonal theory too. Both men and women have high dopamine levels and prolactin levels  in their blood after the climax. Men's dopamine level and prolactin levels drop rapidly after the ejaculation where women have gradual drop of dopamin level and they already have high prolactin levels because of that their Prolactin levels are not dropping rapidly after the climax.

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