Ballade de la Jolie Marion in White Stains by Aleister Crowley.

“Nor thus did love’s embraces wane,
Though lusty limbs grow idle quite;
Our mouths’ red valves are over-fain
To suck the sweetness from the night;
And amorously, with touches light,
Steal passion from reluctant pain.
So has the daystar fled again
Before the blushes of the sky,
So did I clasp thy knees in vain:
For we must part, and love must die.” [via]