Couples therapy:
sex:
Come As You Are by Emily Nagoski. (Science on sex. Available here.)
Stories of Your Life by Ted Chiang. (A short story. Or watch the movie “Arrival” from 2016, but the text is way better. Available here.)
Flowers for Algernon by Daniel Keyes. (I’ve only read the short story. I’m sure the novel is wonderful, though.)
SCIENCE FICTION (for fun):
Fan Fiction (for fun):
Harry Potter and the Methods of Rationality by Eliezer Yudkowsky. (Science, magic, and philosophy. Very long. Available for free here.)