Do you share workspace -- a desk, space around a desk, or a room? Millions of employees do. If conflict over shared space is a problem, create an agreement ("protocols") for use of this space. Without rules, you will naturally engage in work and personal habits applied to this space, and they are not likely to match those of your partner. Tension then begins. Boundaries and rules don't add stress to a coworker relationship, ruin the fun, or destroy spontaneity. In practice, they make a better relationship more likely.