You have to have so much sex that you lose interest in anything but a genuine union of souls and sexual liberation. When mundane, profane, and hedonistic sexual activities are no longer compelling you, then you are ready for transformational sex that results in sexual liberation. Osho said to indulge. He was enlightened. Your lover is encouraging you to indulge. Perhaps your lover is hoping your indulgence will prepare you for a transformational experience. One mutual simultaneous ogasm is all it takes. How long you have to practice in order to attain one may vary from couple to couple.