According to Osho, the subject of sex is chosen because genuine talk of love and truth is impossible while society clings to false notions about kama. Sex is the raw energy that, rightly understood and transformed—not repressed—flowers as love. To move toward truth, we must first break untruths; therefore he begins with sex to clear guilt and taboo, and to show the path of conscious transformation.
We start with sex because it’s the basic energy that can turn into love, and we must drop wrong ideas about it to grow honestly.