This was a very good read and I thought that this in particular nailed it on the head:
All my life, the message I had heard loud and clear was that sex was for pleasure and bonding, that its potential for creating life was purely tangential, almost to the point of being forgotten. This mind-set became the foundation of my views on abortion. Because I saw sex as being by default closed to the possibility of life, I thought of unplanned pregnancies as akin to being struck by lightning while walking down the street—something totally unpredictable and undeserved that happened to people living normal lives….
I came to see that our culture’s widespread use and acceptance of contraception meant that the “contraceptive mentality” toward sex was now the default attitude. As a society, we had come to take it for granted that we are entitled to the pleasurable and bonding aspects of sex even when we are opposed to the new life it might produce.