Hi and thanks for visiting AstrologyMag Forum. Mars rules the 7th house of your natal chart which is the prime house of marriage. Functional malefic Ketu posited in the 3rd house aspects the 7th house. Malefic Ketu aspect on the house of marriage is likely to weaken the 7th house. Venus the karka for marriage is in the 9th house but close to the rahu/ ketu axis. Matching of the horoscope is very important for marital bliss.