My daughter is 11 years old this year, exactly the age group the new HPV vaccines are aimed at. If she was living in Australia she would receive the vaccines as part of the national HPV vaccination programme - probably at school lining up to receive it, giggling and chatting with her friends. I haven't yet broached the subject of sex but I know the day is looming when we will have to sit down and talk. The new vaccines have added a new aspect to this talk. Should I decide the vaccines are for the best and pay privately for her immunisation, do I tell her what exactly the vaccines are for and bring up the topic of sexually transmitted diseases? Or should I be vague and tell her this is an injection to reduce the risk of cancer in later life? According to Professor Ng Man-lun, vice-president of the Hong Kong Sex Education Association, parents should not be afraid to tell children this age everything. 'If they don't understand, they will ask,' he says. 'Telling them more difficult things will not hurt them. In all education, we teach children things they don't understand. 'It is absurd to think if you don't tell them the truth they will not be promiscuous. I know some parents think if we give them the means to protect them from sexually transmitted diseases and cancer they will be more promiscuous but this only protects from one virus and one type of cancer. It is not all-protective. 'You still have to warn them to be careful about sex, the same way they have to be careful about everything in life such as crossing the road. You should tell them the truth, the ethics and the safety aspects.'