At the moment of orgasm, you transcend your separateness and there is a moment when you merge together. For most people that is the direct route to a spiritually transcendent state. What you learn to do in a lot of yoga forms is awakening the sexual energy, not to the point of orgasm - but just to the point where you draw the energy up the spine into the upper chakras, and you use your partnership to keep awakening that energy.
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