It is true that 7th house is the house of life partner and also for the business partner,but mind that first house is the house of king,and 7th is king's minister,8th is the house of eyes of king,then 11th house is the feet of king,when we want to make next work,first goes to check 2nd and it is the house of right eye,always right eye sense a image,and sensing of the image is the 3rd house,after sensing the image,mind clearfy the image true or lie,it is the fourth house,for the clearfy the image,it is depends on the 5th house,if knowladge or education,in mind through 5th,then there are two options in the mind,if that image is valuable,then mind want to fix that image in deep,and on time want to make some profit or want to use in daily works,then require,partner for the making shares about enjoyment,1st is positive and 7th is negative,like a electic supply,if there are not a resistense like people from 4th,works from 10th,or kids from 5th,enemity from 6th,fears from 8th,then both positive and negative end their life within short time.it is the regulations from nature that lord of 2nd,7th,and 11th are must for the making marriage.

If Mars in 7th and
If 7th house is house of Venus-possibilities of many life partners.
If 7th house is the house of Sun-Damaging of Father related works,and business related works.Out side money expenditure in the works for the life partner.
If 7th house is the house of Moon-Damaging power and prestige of father,parts of family properties and no values of emotions.
If 7th house is the house of Mercury-Damaging of grand positions,by life mate,regularized in both male or female,enmity with connected people,hard talk or face accidents,blood type diseases.