Why we are attracted to some people and not others is a complicated question. Of course, the reasons are multifaceted. But, is there part of the equation that is purely biological?
Say you're a man in a committed, loving relationship and you spot a saucy minx making eyes at you. Turns out, you may not be terribly susceptible to her batting lashes if she's at apex of her fertility cycle – or so says science. 
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