Jupiter, Sagittarius's ruler, is the planet of expansion. Saturn, Capricorn's ruler, is the planet of contraction. These very different dynamics require a lot of compromise and mature understanding of each other to forge any kind of relationship. A casual fling is possible because both signs are fond of social and sexual interaction. Pushing away any thoughts of living together, working together, or being lifelong friends, Sag and Capricorn meet in lust. The animal half of the Archer is hot for that horny Capricorn goat, but the basic dichotomy between the signs is wearing for anything longer than a midnight encounter.