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 Midheaven
This combination indicates an active family life. But there could be emotional discord in relation to the considerations of each others domestic affairs. The Midheaven person is likely to be upset with the aggressiveness and insensitive of the Mars person especially in family affairs. The Midheaven person sees the Mars person as a threat to security. There needs to be an understanding of how the Mars person can aid the Midheaven person in their domestic affairs without being overly controlling or impatient with their needs.