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When a child of 11 starts Secondary/High school, they will see and hear lots of things about sex, and may want to have a relationship with someone. Make sure a child is not being bullied into kissing/relationships/sex, by regularly talking to teachers, and to your child.

Article:
Explain to them about sex, the dangers and everything they will need to know while they are at school, so that they do not get fed wrong information at school.