Effects of different planets in the 7th house Everybody is eager to know the effects of different planets in the 7th house of their horoscope. 7th house deals with marriage, spouse, characteristic of spouse and marital harmony. The Natural karaka of marriage and the 7th house is Venus as its Mool-Trikon sign Libra is the natural 7th house of the zodiac, but is the placement of planets in the 7th house beneficial ?