That's a fascinating story, and very thought-provoking. There's probably a psychological component involved in the transition. The human mind equates beauty with harmony and order, which we honor by allegiance to truth and goodness. When those things are violated, I suppose it's only natural that the transgressor would seek to remove himself from proximity to the things which continually remind him of his sin. It makes me wonder how many sexual deviants indulge themselves in atheism, not because they disbelieve in God, but because the idea of God is simply incompatible with what they do. If you've ever read any of the Marquis de Sade's works (quite nasty, but very instructive) you'll see something akin to this.
For some time now I've toyed with the idea of writing a novel concerning a wealthy middle-aged lute player who uses the beauty of Renaissance music to seduce the young girls under his tutelage. I see now that any allegiance to beauty would probably be nothing more than a sham; that such a person's true qualities would be diametrically opposed to the love of beauty. If I ever get around to actually writing the thing, I'll be sure to adjust the plot accordingly.
Meanwhile, here's a nice English lute song that touches on the demise of beauty:
Love stood amazed at sweet Beauty's pain,
Love would have said that all was but vain,
And gods but half divine.
But when Love saw that Beauty would die,
He all aghast to heavens did cry,
O Gods, what wrong is mine!
Then his tears, bred in thoughts of salt brine,
Fell from his eyes, like rain in sunshine,
Expelled by rage of fire.
Yet in such wise as anguish affords,
He did express, in these his last words,
His inifinite desire.
Are you fled, Fair, where are now those eyes?
Eyes but too fair; envied by the skies,
You angry gods do know,
With guiltless blood your sceptres you stain.
On poor true hearts like tyrants you reign,
Unjust! Why do you so?
Are you false gods? Why then do you reign?
Are you just gods? Why then have you slain,
The life of Love on earth?
Beauty, now thy face lives in the skies,
Beauty now let me live in thine eyes,
Where bliss felt never Death.
Then from high rock, the rock of Despair,
He falls in hope to smother in the air,
Or else on stones to burst.
Or on cold waves to spend his last breath,
Or his strange life to end by strange death,
But Fate forbids the worst.
With pity moved, the gods then change Love,
To Phoenix' shape, yet can not remove,
His wonted properties.
He loves the sun, because it is fair,
Sleep he neglects; he lives but on air,
And would, but cannot die.