>On the other hand the act of procreation, being of a will and desire shared and indeed controlled by the fëa, was achieved at the speed of other conscious and willful acts of delight or of making. It was one of the acts of chief delight, in process and in memory, in an Elvish life, but its intensity alone provided its importance, not its time or length: it could not have been endured for a great length of time, without disastrous “expense”.
>But the act of procreation not being one of growth until the union of the seed and being under full control of the will does not take long -- though it is longer and of more intense delight in Elves than in Men: too intense to be long endured.
-The Nature of Middle Earth
