True and Unconditional Love

1
There isn't much research on synastry from the Vedic perspective. I was wondering what you all have gathered on synastry, and in which placements/interactions you can find true or unconditional love. From my studies, I've noted only two placements. Moon and Venus of one party conjunct the South Node (Ketu) of their partner. These are only placements I've learned that can bind two people over lifetimes.

Please offer your opinions and experiences.

LOve

2
I have found that many people married or in a relationship for a long time have rahu/ketu venus aspects. My venus was conjunct my husband'd ketu,. It does not have to be a so-called positive aspect. My dad's venus was square my mom's ketu/rahu AMY
amy maddalozzo