The government announced at the end of March that children from age 11 should be taught about sexual consent.
The lessons are planned for mixed and single-sex state and independent schools in every part of England.
The plans are being drawn up by the Personal, Social, Health and Economic Education (PSHE) Association, an organisation set up in 2006 to oversee PSHE teaching. PSHE will not be made a compulsory subject, according to Conservative plans.