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 Pluto
There is an extremely competitive energy between you as you seek to exert sexual dominance, power and control. Together you can be such a willful couple, intensely and possessively sexual, the drive generated between the two of you is so powerful the it can blot out every other meaningful aspect of your lives if you let it. When the Mars person is in conjunction with the Pluto person, your partner adds energy, primal urges, assertiveness and a fiercely competitive spirit to your willingness to go to extremes to penetrate to the essence of things. Expect fireworks of all kinds.