The other story I got from Lee was very interesting and anecdotally it's true for me as well.
It turns out that there was an experiment in which men didn't shower for three days, so that all of their funk and manstink got into their sweatshirts. Women were then asked to dig into that pile of sweatshirts and find the one they felt most comfortable wearing. The result was that they were most compatible, all of them, and meaning sexually attracted to the man whose genetic profile was most different from her own. This is a natural kind of attraction that makes for human biodiversity.
However, when women are pregnant, that sort of thing reverses. Then they most want to be around family. It makes sense, family will protect her and the baby.
So here's the kicker. If a woman is on the Pill, it works by simulating pregnancy. So a woman who stays on the pill will be more attracted to men who are genetically close to her. If she gets off the pill, suddenly she can't stand him. Similarly, as was the case for me, my girlfriend didn't particularly like me when she got on her birth control, but wanted me around more when sex was risky. After we got married, we had all kinds of headaches until I got my permanent fix and she could be off the chemicals.
So guys. If your girl is on the Pill and tells you that she loves you, she probably doesn't.