Lying in Bed — Mark Harris

When the lustful but impotent professor-novelist Lee Youngdahl encounters the beautiful Mariolena Sunwall, a student in his writing class, he learns of a novel she's eager to have published and decides he can help her land a book contract with one of New York's most prestigious publishing houses. But he has his own agenda and some extracurricular activities in mind. Working for Mariolena gives him the inspiration he needs to break out of his paralyzing writer's block, but that's not all he's hoping to recover from. While his wife Beth is away visiting their children on a seven-city tour, Youngdahl is determined to find a cure for his impotence and revisit his old Don Juan days.