Northern Virginia school officials said yesterday that they oppose requiring all schools to adopt a wide-ranging human sexuality curriculum approved 7 to 2 Monday by the Virginia State Board of Education.

The program would introduce such sensitive topics as AIDS, homosexuality, birth control and abortion to children at an earlier age than under any similar program in the Washington area.

The state board, which adopted the grade-by-grade curriculum on Monday, will vote next month on whether to require its implementation statewide or allow school districts to use it as a guide in developing their own family life programs.

Local opinion on the curriculum reflects variations in the approach that area school systems have taken in teaching their students about sex. The state's plan is more conservative than Alexandria's nationally acclaimed program, but is broader than the programs in Fairfax and Prince William counties. Arlington's plan is similar to the state's.

"It is my hope that the program is not made mandatory," Fairfax School Board Chairman Mary E. Collier said yesterday. " . . . There's a strong feeling among certain members of the community that schools should not interfere in {family} values. We've tried to respect that."

In Alexandria, curriculum specialist Jean Hunter said, "The difference between their program {the state's} and ours is night and day. Ours is more wide-reaching and topics haven't been presented as taboo."

While the state board has the authority to impose its program, the Virginia General Assembly must approve funds to implement it. The cost is estimated at $4 million the first year and $1.5 million the second, said Jean Bentley, associate director of health, physical education and driver education for the state board.

State education board member James Dyke said the state's program was a sign of the times. "In a perfect world a lot of these things should be taught at home," he said, "but a lot of these things are not being taught at home. We are doing our share of dealing with the whole issue of teen-age pregnancies."

The General Assembly ordered the Board of Education this year to come up with a comprehensive family life plan after a legislative subcommittee studied the issue of teen-age pregnancy in the state.

The adopted curriculum is specific, but its overall emphasis is on abstinence, self-esteem, decision-making and emotional development, much of which is already being taught in local schools.

Under the plan, first-grade pupils would learn the correct terminology for body parts and functions. Fourth graders would learn about reproduction. In fifth grade, students would discuss the virus responsible for acquired immune deficiency syndrome.

In the seventh grade, discussion would include the subjects of masturbation, adolescent sex outside marriage, birth control and homosexuality in the context of the transmission of AIDS.

Bentley said students also would be taught that homosexual acts are illegal in Virginia.

In ninth grade, students would learn about spontaneous and medically induced abortions.

Most school systems in Northern Virginia already teach students about AIDS, homosexuality, abortion and birth control, but at higher grade levels and as part of elective health or home economics courses.

In Arlington and Prince William counties, homosexuality, abortion and birth control are discussed in high school; they are not addressed in Fairfax.

In Alexandria, ninth-grade students are required to take a year-long family life course in which homosexuality, abortion and birth control are discussed. Birth control is introduced as a topic in sixth grade.

As part of its actions Monday, the state board left local schools to decide if and when to separate boys and girls during the discussions. It also said that school systems could switch topics in the grade-by-grade plan at the elementary level; at the secondary level, schools could move topics forward or back one year from the state's guidelines.

Citizens and conservative religious groups that opposed the plan during public hearings last month argued that sex education should be left to the family and that some of the subjects are taught at too early an age.

State board member Sandra Vaughan of Petersburg, who voted against the plan with Adelard L. Brault of Fairfax, said she was concerned that discussions of reproduction planned for the first through third grades would lead to explanations of sexual relations and intercourse.