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 Opposition Saturn
You may get the feeling that your assertiveness and drive are restricted by your partner, as though you are constantly being checked, watched, and judged. You will need to discover together what you really want from your romantic relationship in order to overcome the limitations you have placed upon yourselves. When the Mars person is in opposition to the Saturn person, there will be considerable feeling of frustration where your life together can seem like a struggle against overwhelming odds which will take patience, forbearance, and persevering effort to overcome.