I thank you for the sources. What I was specifically doubting was the linkage between attrition and sexism(which doesn't seem to be mentioned in the text you quoted). I will take a look over the links you provided this evening, but if you have anything more specific to add on the linkage between attrition and sexism, I'd love to hear it.
You naturally cannot use a microscope and come to a fixed, proven conclusion. However, I would say that all of the causes of attrition are very likely based upon a prevailing systemic gender oppression (sexism.)
I guess you cancel out my intuition with your random opposing statement and we are left with me with a ton of links to studies and you with absolutely nothing.