Some general combinations in Navamsa regarding married life.

Om Namo Bhagavate Vasudevaya - ॐ नमो भगवते वासुदेवाय

Here are some general combinations in navamsa regarding married life.

1) Navamsa lagna aspected by a benefic can give a happy married life.
2) Navamsa lagna lord aspecting navamsa is a good combination for a peaceful married life. 
3) If navamsa lagna and navamsa lagna lord are vargothama then, ur spouse will be very adaptable. 
4) It is better to have a navamsa lagna with a subhakartari yoga which will help u to tide through any difficulty.
5) Benefics in the 5th or 9th to navamsa lagna indicates that u r handsome.
6) If navamsa lagna happens to be 9th or 12th to the janma lagna, physical needs may be very high.
7) If navamsa lagna is associated with many malefics, there could be extra-martial relationships.
 If the lord of 3 or 6 or 7 or 10 is posited in the 7th to navamsa lagna ur spouse may have a career in law.
9) venus in the 7th to navamsa lagna indicates disharmony in marriage.
10) If the lord of 7th in rasi is in 6 or 8 or 12 to navamsa lagna, married life may not be pleasant.
11) If the lagna lord or the 7th lord are associated with incendiary planets, then there could be separation.
12) Conjunction of Moon and venus and if one of them is debilitated, there will be no happiness from marriage.
13) If the 5th from the navamsa lagna is occupied by Jupiter and venus, u could get ravishing beauty as ur wife.
14) If the 7th happens to be the house of saturn and if malefic are in it, the spouse could look old or it could be a second marriage.
15) If venus is in the amsa of Mars or in the house of saturn without any benefic aspect, there could be sexual perversions.
16) If venus is in the navamsa of Moon, the whole married life will be full of problems.
17) If the 7th lord conjuct with the 6th lord and also venus, there will be separation or divorce.

These are general principles and should not be taken verbatim. Pls also consider the aspect and conjunction of other planets before coming to a conclusion.