A Little Bit of Fiction to Tell the Truth

"For a marriage to last, Ronald believed that both partners should possess a stubborn will, fear of failure and a strong sense of shame of breaking from convention--mind you, this was not a recipe for a happy marriage, but it could make two people stay married. If two people had a lot of sex, that was helpful. Having many children did not keep a marriage going, despite all the for-the-sake-of-the-children talk to the contrary. In fact, the more kids there were, the more likely the man would cheat and the woman would be too busy to notice or too tired to care. Men left when the children were not so adorable, and the women were too old to marry again..."

This passage is from a novel written by a woman whose back-flap bio mentions that she lives with her husband and son...go figure.

And why do author bios almost always include mention of a spouse, if there is one? How does this help us understand and appreciate their literary contributions?