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 Trine Saturn
You are feeling more patient, persistent, your assertiveness is channeled into stamina and staying power. It's just as well because you want to build a relationship that is solid and enduring. When the first persons Mars is trine to the second persons Mars, they will find it easier to make commitments. The only drawback might be their willingness to forgo some of that sensual passion and sublimate those energies toward future goals rather than present sexual gratification.
Useful Mars Trine Saturn Crystals