One of the great achievements of the Internet has been to put all kinds of information at the fingertips of millions of people. From online encyclopaedias to search engines, some of the most successful online services have been ways of providing answers to people's questions. It's not surprising, then, that more and more young people are relying on the Internet to answer their questions about that most uncomfortable of topics: sex. Some people, in fact, have even suggested that the Internet makes those awkward, politically troublesome sex ed. classes irrelevant.