The topic of sex is very awkward for Asian parents, because in traditional culture, people never talked it in the public occasions and they treated it as shame thing. While situation is different in western countries. Children receive sexual education at a very early age. Every teenager should receive right sexual education.
In China, it is the very classic situation that when the child asks his parents how he comes to the world, then the parents will tell him that he is picked up from the garbage. Parents doing this to avoid sex topic, and they think they are doing the right thing to the child. Actually, they are misleading the young generation to know about the world.
Look at the western countries, parents will tell something about sex when their kids are in primary school, and school also open relative course to let children know this issue, so as to have right attitude towards it and better protect themselves.
It is in need of receiving proper sexual education for teenagers, so that they can know the world better.