Freedom in this context will last only as long as those involved are willing to act responsibly in order to preserve that freedom. We all have many choices to make in our lives, especially in our democratic society. If we choose to drive our automobile in an unsafe manner and cause an accident, we are responsible for that action and its consequences. If we choose to break to law in any other way and are caught, we must pay the penalty according to the law. In the realm of personal freedom, we are responsible for our actions.
Human reproduction is no different.
If we choose to have intercourse and it results in the conception of a child, we are responsible for that action and its results. At that time of choice, our choice has been made. If it is our desire together or separately not to produce a child, then we have to take the responsible action to prevent that result. Another fool proof option is abstinence. Many people in today's society have a difficult time accepting this basic concept of freedom and responsibility which are inseparable.