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 Conjunct Mercury
Your romantic partner stimulates your mind and inspires your intellectual creativity. You may find yourself talking and thinking about sex. Vigorous discussions and intellectual debates will be a focal point of your relationship. When the Mars person is conjunct the Mercury person, your partner will enjoy mentally and verbally sparring with you as well as being more vocal about their desires and fantasies.