Oregon appears set to join California, Washington, and Montana in requiring that insurance plans cover prescription contraceptives. The Oregonian reports.

The state senate approved the contraceptive coverage bill yesterday, following the state house’s earlier approval. The governor has said he’ll sign it.

The result will be to add another large group of Cascadian women to the ranks of those for whom sticker price won’t be a deciding factor in choosing the best form of contraception.

The law applies to health insurance plans that provide prescription drug coverage, requiring that such plans include prescription contraceptives such as the pill.

Laws like this one reduce the number of unintended pregnancies, because they enable more couples to use the most effective forms of contraception. That means, more children are born wanted.