If Ketu occupies the 7th house married life is harmed, as there are constant ups and downs with the spouse. The Hindu scriptures declare that the person is attracted to "lowly or unchaste women". The marriage partner may be weak, sickly, or lacking in confidence. The spouse may also be weird, strange, or deceitful. He or she may also be spiritual, psychic, or of an ascetic or discriminating nature.

UCHCHA (exalted). If Ketu is in Gemini or Virgo in the 7th house (or stationary direct or in forward motion), marital life is disturbed. However, the spouse may be especially intelligent, special, or spiritual. The marriage partner may also be of an ascetic and extremely detached and discriminating disposition.

Source: «Ancient Hindu Astrology for the Modern Western Astrologer» by James Braha