So the Natal Chart will always be the point of departure into relationships. A lot of conjunctions There is osmosis in this relationship and you often see this in people who grow old together and start to look alike, talk alike and in many ways are the same. They will have a tendency to identify each other by roles. In some respects this can be an ideal but can also become a bit predatory or co-dependant. With this tonal quality, there is both positive and negative.
Conjunctions are the foundations of the chart.
It's where people agree, where there are few disputes and hence compatibility that is a true melding of energies. This represents a solid foundation that provides a base for lasting interface. So if there are plenty conjunctions, there is commonalty and communion. But too many, sets the relationship in concrete to the point where is becomes static and lacking in energy. An osmotic relationship is fraught with the danger that one of the partners can, by the strength of personality, entirely swamp the other.