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 Inconjunct Saturn
This relationship promises a lot of serious hard work on the part of both romantic partners. You both have very different and non complementary approaches to assertion, sexuality, timing, and attitude, so much so that you will be constantly accepting the necessity of compromise in order to get anything accomplished. When the Mars person is inconjunct the Saturn person, you may be having to overcome feelings of inhibition and restriction, and find him/her quarreling with you over who is really committed to your long term goals and what gratification needs to be put off in order to meet present duties and obligations.