Metaphysics is the branch of philosophy investigating principles of reality transcending those of any particular science. Cosmology and ontology are traditional branches of metaphysics. It is concerned with explaining the ultimate nature of being and the world.
Love is a biological necessity, a force operating to one degree or another in all biological life. Without love there is no physical commitment to life, no psychic hold. Love exists whether or not it is sexually expressed, though it is natural for... love to seek expression. Love implies loyalty. It implies commitment.