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It's that they want sex for different reasons.

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The answer to that question depends on whether women base any long-term relationship decisions on the changes that happen around ovulation, Haselton said.

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Multiple studies have found that women go for more masculine-looking men when they're ovulating.

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Perhaps women really did evolve to conceal ovulation but can't quite cover up all the side effects, Haselton said.

Description: For instance, fertile women seem to be more open than non-fertile women to the idea of taking "sexual pleasures where [they] find them ," in the words of one question asked to participants in the study by Gangestad and his colleagues published in the November issue of Evolution and Human Behavior. Ovulation and lust Until about a decade ago, most research on the menstrual cycle focused on PMS, which occurs after ovulation and before menstruation.