Brahman is the ultimate reality; it is simultaneously Saguna and Nirguna; divisions are due to ignorance. Mind and intellect can never catch hold of it; they have only one option and that is to merge with it.
Of all the miracles Po had seen in the time and space of its death, Po thought this--the absorption of another, the carrying of it--was the most bewildering and remarkable of all. Whenever Bundle separated again, Po was left with an ache of sadness that reminded the ghost of the body it had left behind.
Each time we connect physically with another a merger is happening, a merger that goes beyond just a physical connection. The first layer of sex is energetic, not physical.