The solution to the unwanted children who are being born is that their unmarried mothers should keep their legs together in the first place. No form of birth control is perfect.
read the rest of what i wrote... i advocate two forms of contraceptive for a sexually active woman who does not want to get pregnant. that's two female contraceptives, say the pill and diaphragm... and they should still have the man wear a condom... to prevent disease and pregnancy. That's triple layered protection.
besides - personal responsibility does include abstinence, but even abstinent women should consider the pill if their lifestyle involves parties, alcohol, and frequent contact with with men in loosely structured situations. and in the case of rape, we need to figure out a way to get women to feel comfortable about going to a hospital within 72 hours to receive a rape kit, and report the crime.