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<img loading="lazy" src="https://cdn.kahimyang.com/resources-8/female.webp" alt="Female orgasm" />
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Some evolutionary biologists reckon the female orgasm is adaptive and possibly influences mate choice, strengthens pair bonds or indirectly helps to suck sperm into the uterus. Others argue that women have orgasms for the same reason that men have nipples – being highly adaptive in one sex, the traits tag along for the ride in the other.
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Brendan Zietsch at the University of Queensland, Australia, and Pekka Santtila at Abo Akademi University in Turku, Finland, think they can help to settle the question. If female orgasm is a simple by-product of male orgasm, the duo argue, then similar genes would underlie orgasmic function in both men and women. As a consequence, opposite-sex twins and siblings will share more similarities in their susceptibility to orgasm – "orgasmability" as Zietsch calls it – than pairs of unrelated people.
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The mystery of female orgasm