The most integral aspect of any relationship is communication.
We meet someone and talk with them so we can get to know them.
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Over time, the ability to parse a woman's menstrual cycle could have proliferated, as more perceptive men reproduced more successfully.
There is no other way to become enamored with someone, and they with you, than to exchange thoughts, ideas and signals. " It's a question most women have been asked at one point or another by their boyfriend or spouse during a disagreement.It turns out that some men actually can tell when it's a woman's time of the month—and it's not because of bratty behavior.Males show more interest in females when they're fertile, so it makes sense that human females—who need a lot of help to raise their particularly helpless infants—hide their fertility status.(Female chimps, by contrast, broadcast their fertility with engorged genitalia.) Theoretically, human males retaliated by developing the ability to detect more subtle fertility cues such as those "leaked" by the female voice.