How does, at the point right after male orgasm, genital stimulation go from pleasurable to not when the nerves are being stimulated in the exact same way?
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To expand on the food analogy someone posted earlier…
It makes evolutionary sense for you to eat food so you get nutrition and survive. So your body sends you pleasure when you eat food. However, if you eat too much food at a rate you can’t digest it, you’ll throw up. Throwing up defeats the survival benefit of gaining nutrition. Hence your body sends you “full” signals (combination of nerves firing and hormone production) so you stop eating food once you have enough.
From an evolutionary perspective, you also need to reproduce. Your body sends you pleasure when you have sex so you keep doing it until ejaculation happens. For men, further thrusting beyond ejaculation is just going to damage or dislodge his sperm, reducing the likelihood of successful fertilisation of the egg. Hence, body switches nerve and hormone signals from pleasure to pain (and sleepy hormones) so men stop thrusting.
However, for women, the more semen deposits, the higher the chance of successful fertilisation of the egg, which for most women can only occur in a short time interval each month. Hence, women can keep having sex (ideally from different male partners) and gaining pleasure, to best take advantage of a limited time window.
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