Should it be a legal requirement for all children to have sex education?

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In the UK, sex Ed is taught in all schools. It normally starts in year 6 (ages 10-11) and as you get older the content is more age specific. BUT: you have to have parental permission to receive sex Ed in schools. Should parents be able to opt out of sex education? If you can’t opt out of maths or science, should it be legal to opt out of sex Ed, which is arguably more important?