OMAHA, Neb. (AP) — Sex education opponents have made a last-ditch effort to delay the Omaha school board’s rollout of textbooks and materials that will appear in health and sex education classes in the fall.

Omaha Public Schools staff presented their choices for curriculum materials that will teach students about puberty, birth control, healthy relationships and more. The board is scheduled to vote on the curriculum purchase May 16.

During public comment Monday, opponents said the district had already waited 30 years to change the curriculum, which hasn’t been updated since 1986. They argued that the board should take more time to review options to make sure the curriculum is age-appropriate.

Others recommended the district adopt an opt-in policy for each family to actively grant permission for its child to take such classes.