Comment1: Replace the word "Sex" with "Violence" and you have a front page story in MSM.
Comment2: The sexual situations shown on television are very often of unhealthy relationships in which people objectify each other. Health and Sex ed classes should be informative biology and anatomy lessons and no more. Parents need to be responsible for teaching children both through word and deed about how and when to express love and affection.
However, knowledge of how not to contract a disease can and needs to be communicated -in a manner that does encourage promiscuity. The health of a population is indeed the governments' business. If citizens are not educated in school about this topic when will they be? (If you say "by their parents", then wait 2 generations and now no one has been educated).
It is appropriate to question how health/sex ed. is being taught, but not whether. It is a public health issue which, in every positive historical circumstance has always trumped moral sensitivites.
I'd recommend placing upper and lower bounds on the age. Parents could then select an age within this range.