New draft guidelines on relationships and sex education (RSE) could create fresh problems for Charedi schools by recommending that LGBT issues should be "integral".
The proposals, released for consultation by the Department for Education this month, would apply to all schools, including faith and independent schools.
While new legislation gives religious schools licence to teach RSE according to their values, the consultation document suggests it will be hard to exclude certain topics.
The draft guidance states: "Schools are free to determine how they address LGBT-specific content, but the department recommends that is integral throughout the programmes of study."