COLUMBIA — Advocates of a bill co-sponsored by two Republicans say South Carolina’s 25-year-old law on sex education must be updated to decrease teen pregnancy.

A news conference organized by the New Morning Foundation is set for Tuesday morning at the Statehouse.

The group advocates passage of a bill that calls for the teaching of “medically accurate and factual” lessons on reproductive health and pregnancy prevention to high school students. Under the measure, the teacher of the class must be certified in health education.

It specifies that reproductive health education include lessons on abstinence, contraception, and how to prevent unintended pregnancies and sexually transmitted diseases. It deletes the requirement that male and female students learn about pregnancy prevention separately.

Co-sponsors are Reps. B.R. Skelton of Six Mile and Jenny Horne of Summerville.