A Quote from P.D. James' book The Children of Men:

A failed marriage is the most humiliating confirmation of the transitory seduction of the flesh. Lovers can explore every line, every curve and hollow, of the beloved's body, can together reach the height of inexpressible ecstasy; yet how little it matters when love or lust at last dies and we are left with disputed possessions, lawyer's bills, the sad detritus of the lumber-room, when the house chosen, furnished, possessed with enthusiasm and hope has become a prison, when faces are set in lines of peevish resentment and bodies no longer desired are observed in all their imperfections with a dispassionate and disenchanted eye.

In a book I already think is sad, this bit really is depressing