Susan Sarandon and Tim Robbins natal planets only
Here's an example of what we miss when we fail to include progressed planets in synastry. In fact, because there is a natal Sun (C3) natal Venus (B6) semi-sextile, you might think this aspect is good for relationships.
Susan Sarandon and Tim Robbins natal and progressed planets
But you would be missing the point. Here are two Sun Venus conjunctions, a Venus Venus conjunction and a Venus Mars opposition at work in 1988.
Susan and Chris Sarandon natal planets only
For Susan and Chris, it is a similar pattern of nothing much happening in their natal synastry...
Susan and Chris Sarandon natal and progressed planets
...but a pVenus pVenus trine and two Sun Venus trines make 1968 a very limerant year.