On one occasion, the Buddha said to the monks this:
"No other form do I know, O monks, that so persists in obsessing the mind of a man as the form of a woman. The form of a woman persists in obsessing the mind of a man.
When beauty is abstracted
Then ugliness has been implied;
When good is abstracted
Then evil has been implied.
So alive and dead are abstracted from nature,
Difficult and easy abstracted from progress,
Long and short abstracted from contrast,
High and low abstracted from depth,
Song and speech abstracted from melody,
After and before abstracted from sequence.