Sex education is a sensitive area for some parents, and thus it should remain optional.

性教育对一些家长来说是个敏感的话题，因此应该还是非强制性的。

《柯林斯英汉双解大词典》

The second line of research often used to justify single-sex education falls squarely within my area of expertise: brain and cognitive development.

经常被用来为单性别教育辩护的第二条研究路线恰恰在我的专业领域之内：大脑和认知发展。

youdao

In a statement, Mr Knight said parents did not have the right to withdraw their children from the statutory sex and education part of the curriculum, only the optional PHSE element.

BBC: RELATED BBC SITES

Compulsory personal, social, health and economic education and also sex and relationship education needs to be considered, Ms Abbott said.

BBC: Diane Abbott: British culture 'increasingly pornified'

Appearing before the same committee, which has been set up to scrutinise the plans, Education Secretary Michael Gove was asked about the implications of legalising gay marriage for the teaching of sex and religious education in schools and was asked what protections there were for teachers who had moral and religious objections to same-sex marriage.

BBC: Maria Miller