syndyastic

Etymology
From, a hapax coined in the of Aristotle, introduced by Kurt Klaus Loewit and  who in Berlin 2004 wrote a coursebook about Sexual Medicine in Clinical Practice inventing syndyastic sexual therapy, which makes it naturally a  now chiefly encountered in Berolinese sources.

Adjective

 * 1)  related to coupleship, the requirement to realize intimacy with a partner