CONCORD, N.H. — Gov. Maggie Hassan says a bill that would require schools to give parents two weeks’ notice before using sexually explicit material in class would make it harder for young people to receive public health education or study important literature.

Hassan expressed her concerns with the bill Friday after she vetoed it. The bill says either a school district or teacher must give parents advance notice before using course material centered on human sexuality or sex education.

Hassan is raising concerns that the bill would create a stigma around sex education in schools and could keep students from learning about contraception or sexually transmitted diseases. Opponents argued earlier this year that the bill could lead to objections around classic literature such as William Shakespeare’s “Romeo and Juliet.”

Supporters of the legislation say parents have a right to know if their children will be dealing with material they may find objectionable.

Under existing law parents must identify, in writing, what material they find objectionable and agree to an alternative for their child to still meet educational standards.

The issue of explicit material in schools came to the forefront last year when a father in Gilford objected to his daughter’s class reading the novel “Nineteen Minutes” by Jodi Picoult because it included a sexually explicit passage.

The bill passed both Legislative chambers largely along party lines, making it unlikely there will be the necessary two-thirds threshold to override Hassan’s veto.