Your relationship is based on logic and common sense, faithfulness and deep reciprocity.
I can thin of another name for that – the wise love. What you relationship lacks is surprise and spontaneity – but who needs it? Does the woman Capricorn think in the same way? Not really, but she would never speak out her discontent of this state. Material success is important for both of you, so you will support and encourage each other in achieving your goals. It is hard for you to express your feelings with words so you will both give the most of yourselves in bed. With time your sexual harmony will deepen but passion will decrease, unless you have a strong influence from the fire or water signs in your astrological map.