This requires a zone that is protected by respect for individual autonomy and reverence for the privacy of intimate human relations. It cannot be denied that this is traditionally central among the values for whose protection the United States, and its Constitution, stands. The liberty involved in deciding whether to terminate a pregnancy is, in part, the interest in being able to avoid pregnancy without abstaining from sex, the liberty recognized as fundamental in the contraception decisions. But it is much more. Indeed, the right to decide whether to end a pregnancy lies at the very intersection of several liberties that must be deemed fundamental. . . .
Pregnancy entails unique physical invasion and risk. . . .
If the constitutional protection of our individual rights and human dignity means much of anything, then the freedom to decide whether or not to endure pregnancy must be deemed a fundamental aspect of personal privacy.