A well positioned mars in a female horoscope and well place venus in a male horoscope shows how the marital life and relationship will progress in one's life.
Blessed are those males who have good venus without any asc/lagna and natural malefics aspecting or conjoining it. Similarly, blessed are those females who have good mars in their chart without any blemishes.
Mars/Venus conjunction or aspect are by far successful partners who live a good married life, provided no snake planets or malefic join them in someway.