Mars shows what a woman is attracted to in a man. Being with a man who is strong in her Mars element, or who makes close sextiles with her Mars, makes the relationship much easier, and increases sexual desire and compatibility. For a man, his Mars is part of his masculine nature, so it is best when his partner also relates well with this element.
Mars Square Uranus
You both want what you wan now what ever that takes, wherever that takes you. Intense impatience, a assertive and challenging nature, and a reckless sense of freedom can set you up for wild unpredictable times when you disagree with your partner. When the Mars person is square the Uranus person expect sudden shifts in direction, your sexuality can go from electrifying to a personal need for batteries in a matter of moments. What begins as wild ad free together could cross over to wildly deviant unless other factors mitigate this aspect.