Sha‘ar Ma’amerei Rashbi, 29b.

Jewish Mysticism
This delight (sha‘ashu‘a) is for the sake of the copulation (ziwwug), to bring forth the masculine waters from above to below, for just as there is delight in the souls of the righteous below in relation to the feminine waters so there must be delight in which to take pleasure and to bring forth the masculine waters in the secret of the wine that gladdens, and from our flesh we see that the joy and delight increases the desire.

Translated by Elliot Wolfson in “Divine Suffering and the Hermeneutics of Reading- Philosophical Reflections on Lurianic Mythology,” in Suffering Religion, 101-162, Edited by R. Gibbs and E. R. Wolfson. New York and London- Routledge, 2002.