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Yes, it's an evolutionary thing. This is one of many ways females compete for reproductive conditions.
For the record, human females somewhere along the way also gained the ability to hide their cycle from males (compared to females of other species who display ovulation quite prominently), giving them another advantage in terms of seeking male-based support regardless of where they are in their menstruation. This is typically referred to as the "loss of estrus."
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Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön
Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot
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