Sun Conjunct Mars love Synastry ~ Ego Conflict
The Sun is the source of all energies. These energies stimulate the activities of the houses occupied by the transiting Sun and reinforce or weaken the planetary effects, depending on the Sun's aspect to the natal planet. When the Sun transits an inner planet, it may trigger a dormant aspect between that inner planet and a slower moving outer planet. If a planet is being transited by another planet when it is being transited by the Sun, the effect of the transit is strengthened.
Sun Conjunct Mars
A Sun conjunction Mars aspect indicates that you will have an active role in your partners goals, lending power and influence to what ever course they take, helping them face challenge and overcome obstacles. Powerful physical sexuality is indicated, emphasis will be placed on your goals for self expression and your partner will encourage your efforts. It can produce sever ego conflicts. There is apt to be a sense of competition on a friendly basis.