To answer the question posed in the original topic, I don't tihnk any line needs to be drawn when it comes to a woman making a decision about her body. If she has one abortion, or eight or more, that is entirely her choice. No one has the right to tell a woman what she can and cannot do with her own body, even though many of the fundie pro-life extremists like to think otherwise.
Honestly, I think abortions should be made easier to obtain, without the pro-life propaganda being forced in the patients' faces. I think if a woman wants to abort an unwanted child, then there is no reason for doing so that is better or worse than another. Some women don't want to give birth out of fear they won't be able to give their kids up, while some just don't want to be pregnant, or some know they can't afford kids, and it should be left up to the woman to decide what will become of the fetus.