Excellent Darrell!  The article seems to assume the standard "women are not sexual beings" credo.  I was also considering the same alternate possibility you cam up with:  a woman's desire might depend on changing partners.  Of course, this does not fit the dearly held stereotype, so apparently it was not on the radar.  This reminds me of the theory we learned in my earliest science class about male and female primate behavior.  The standard explanation for female primates living in a group with one adult male was because the females only needed the one male for reproduction and tha males needed to spread the DNA.  Current DNA analysis shows a completely different story, with female primates apparently sneaking off to make babies with other males.  The behavior theory was manipulated to fit the stereotype of male and female behavior held by the theorist.  Such is life!