Here are excerpts from various texts relating to controlled intercourse. They have interesting insights about the potential that lies in reuniting male and female for a higher end. More excerpts can be found in the articles in the left-hand menu.
Outline of Source Materials
Taoist
Neo-Taoist
Gnostic
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Poem about the Divine Sophia (a name, meaning "Wisdom," for the feminine aspect of God used by the early Christian Gnostics and others) by Giordano Bruno (1548-1600)
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Neo-Gnostic
Samael Aun Weor
More Metaphysical Sources