Saturn in Synastry

Strong close intra-aspects -- max orb 2-3 degrees (either square, opposition, or especially the conjunction and/or quincunx) between a couple's natal Saturn and either Mars or Jupiter in the other's chart is quite often indicative of a "past life"

agenda

and will typically manifest as a behind the scenes "tension"

Saturn is a big key in delineating karmic "complications". sometimes overcoming these "complications" turns out to be the glue that helps couples "stick"

but, more often than not, it is the stick that beats them down