I go for really smart guys, ones who are well-read and can banter and argue. Men need to be able to take me out and have a few drinks, but by the end of the night we'll be talking about Nietzsche.
The activities and effects of the Fire and Air elements in the astral sphere call forth the astral-electric fluid, and the activities and effects of the Water and Earth elements call forth the astral-magnetic fluid. The spirit-beings use these fluids to create the effects or rather the causes in our physical world. The Akasha Principle of the astral sphere maintains the harmonious equilibrium of the elements in the entire astral sphere.