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Originally Posted by sapiens
In fact, many might characterize the female as dominant. Due to the generally greater parental investment of females, you will typically find male-male competition and female choice. Choice, as in females usually have more choice than males regarding with whom they mate.
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Yes, and I think it would also be important to note in particular the difference between menstruation and estrus. The latter occurs in mammals such as dogs and cats, where the female shows noticeable physiological changes that will reveal when she is ready to mate. The male will know the opportune time to take a chance at passing on his genes by playing his part in creating offspring.
With menstruation, however, males are generally clueless as to when the female's cycle is at its height. This gives much of the sexual leverage to females as it encourages males to act as non-stop providers to their mates, because, hey, you never know when the time is right, so you might as well hedge your bets.