I was reading Cracked.com and came across this article.
I found this interesting, especially considering the part about females being more Si than males....scientists have just discovered that the birth control pill has strange effects on a woman's memory. To explore this, they showed a group of women (half on the pill and half not) a film and asked them a bunch of questions about it afterward. What they found was that the women who weren't taking the pill generally had a pretty good eye for details. The others, however, tended to fumble along like toddlers in a pool made of Jell-O.
The results backed up something that the researchers suspected about how the pill messes with the female body. It comes down to the differences in the way men and women remember. Women typically retain smaller details, while men recall the bigger picture -- men see the forest, while women see the legs on the aphids on the leaves on the trees.
But birth control pills alter a woman's hormones, specifically by lowering the ones associated with reproduction. It makes her brain more dude-like. So, she starts to remember just the big picture, like a dude. Remember, everything in the brain is connected -- change one chemical, and the effects ripple out into other areas.