On the other hand, proponents of abstinence-only sex education object to curricula that fail to teach a standard of moral behavior; they maintain that a morality which is based on sex only within the bounds of marriage is "healthy and constructive" and that value-free knowledge of the body may lead to immoral, unhealthy, and harmful practices. Within the last decade, the federal government has encouraged abstinence-only education by steering over a billion dollars to such programs. Some 25 states now decline the funding so that they can continue to teach comprehensive sex education. Funding for one of the federal government's two main abstinence-only funding programs, "Title V", was extended only until December 31, 2007; Congress is debating whether to continue it past that date.