I am a big fan of Alain de Botton. He manages to poetically capture the essence of modern life struggles, throws a life ring of information and proposes reframing exercises to shed light on the big existential questions we seem to be stuck at.
In his deceptively titled book ‘How to think more about sex’ he gives a perfect bird’s eye view on what constitutes a successful marriage – the subject which you know interests me greatly. He nails it completely in these 4 and a bit pages (hope you can forgive my page photographing skills!)