Conjugal love or the friendship of spouses can persist even after sexual desires have weakened withered and disappeared.
Marriage is an act of will that signifies and involves a mutual gift which unites the spouses and binds them to their eventual souls with whom they make up a sole family - a domestic church.
I have to keep up with the scientific literature as part of my job but increasingly I found myself reading things that weren't really relevant to my academic work but were relevant to gardening.