When it comes to relationships, it is the ways in which we are the same that creates closeness between us. Shared values, shared world view, shared goals, shared interests, time spent together and so on. But it is distance and difference which creates and renews desire in a long term relationship. Because a lot of couples spend a lot of time together and sleep in the same bed every night, they can end up very deeply bonded on a friendship and love level, yet find that their attraction to each other gets weaker the longer they spend together. All is not lost though, as there are some very practical things we can do to keep desire alive.
All sacred sexuality traditions, indigenous traditions and esoteric teachings of the major religions from around the world and through the different ages teach this: All of creation stems from the interplay of masculine and feminine energies. The making love of Shiva and Shakti, yin and yang, expansion and contraction, action and receptivity, chaos and order, night and day, positive and negative are all expressions of masculine and feminine energies. This is the the dance of life.