It is difficult for José Antonio Marina to accept that the news about sexuality today look like a war report and that the future of sex seems to be in the hands of a failed intelligence. "Personal relationships have changed into a continuous battle" says a known sociologist. That is why, to collaborate with the construction of a successful intelligence, Marina has writen a Manifesto for a Second Sexual Liberation. Perhaps an anachronistic aim at this stage? Isn't this liberation a conquest already achieved? Apparently not. The first sexual revolution was useful for us to ge rid of superstitions, injustices and guilt. We protected ourselves from the mistery of sex by trivializing it, but it is time to move on from the practice of ingenious sex to the knowledge of sex as a great emotional creation. Is a sexual ethics possible or, in other words, how can we achieve a practical knowledge about sexual happiness?