Why did Alan Bennett give the title “Smut” to this admittedly slight but always enjoyable and often hilarious pair of novellas? Maybe it’s a coy apology for a book that celebrates several varieties of sexual activity, a subject he has said was barely mentionable in lower-middle-class Yorkshire, where he was raised. Maybe it’s a defiant cry from a writer who has accused his younger self of being bashful, diffident and very, very repressed. Maybe the title is wry, rueful, ironic, nostalgic and mischievous — all of which “Smut” itself turns out to be.  Although this celebrated playwright admitted in “Untold Stories,” the 2006 collection of autobiographical writings in which he acknowledged his homosexuality, that he comes across to the world “as a donnish figure in glasses,” he added, “This isn’t really what I feel like at all.” And sex has figured a great deal in his plays and prose.  Take “The History Boys,” which is largely about the vagaries of testosterone in a British school. Or “A Bed Among the Lentils,” the television monologue in which a vicar’s frustrated wife finds sexual solace with an Asian shopkeeper.  Or “Habeas Corpus,” a half-serious farce, staged way back in 1973, about the libido’s clamorous, inescapable demands. Prominent among its sexually demented characters was one Canon Throbbing, a voyeuristic clergyman whose final speech includes what Mr. Bennett has said is a cry, or wail, from his own heart: “My life I squandered waiting, then let my chance go by.”  That has very nearly also become the cry of the title character in “The Greening of Mrs. Donaldson,” the first and stronger half of “Smut.” She’s a respectable widow with a puritanical daughter who expects her to retreat into purdah after her husband’s death has ended a marriage in which sex was “a stern, tight-lipped affair.”  But no. Mrs. Donaldson takes a part-time job as a “simulated patient” in a medical school, acting out often embarrassing and intimate symptoms and ailments, from Tourette’s syndrome to rectal bleeding. And she takes in one of the students as a lodger, along with the girl’s boyfriend, who suggests an original substitute for overdue rent: Mrs. Donaldson can come into their bedroom to watch them having sex.  Implausible? Perhaps. But it leads to some undeniably comic moments, with Mrs. Donaldson, medical exhibitionist turned genteel voyeur, bringing cozy cups of tea as a post-coital thank you to the young performers, only to find the drink going cold as they leap into yet another energetic, exuberant embrace.  And it’s that exuberance that shows her what she’s been missing, and keeps her ear fixed to the shared bedroom wall even on those occasions when the rent is paid and private copulation occurs. For her this is a “holiday from respectability” — and may, it seems, result in a still more eventful, fulfilling vacation.  Mr. Bennett has always made gentle, sympathetic fun of the sort of staid and placid people he knew as a boy, savoring the droll banalities of their speech and, especially in the case of frustrated women, imagining them in incongruous situations.  There is, for instance, a wonderful episode in which an earnest student hones his sympathetic skills by breaking the news of her husband’s death to the simulated patient, only for Mrs. Donaldson to denounce the defunct spouse as a “bastard” and “swine.” Though Mr. Donaldson himself seems to have been no worse than dull, that comes across as a refreshingly pertinent comment on her own marriage.  As Mr. Bennett sees it, most people are prisoners in their lives and badly need releasing — and, if so, his Mrs. Donaldson is a prime example of belated liberation.  There’s plenty more liberation in the second novella, “The Shielding of Mrs. Forbes,” given an even more distinctively English spin. Everyone is concealing true feelings. The small-town saturnalia is unacknowledged, underground, furtive.  The aggressively respectable Mrs. Forbes’s adored son, Graham, is actually a narcissistic homosexual who marries a woman who seems dim and unprepossessing but is a financial genius who secretly saves him from ruin. She also starts an affair with her father-in-law, whose sex life has come to consist of long-range encounters on the Internet.  Together these two quietly save Graham from a gay police officer who is blackmailing him. They also ensure that he becomes the father of twins, or mistakenly thinks he does.  Jubilant stuff, as is “The Greening of Mrs. Donaldson.” In both stories Mr. Bennett’s prose occasionally and almost unnoticeably switches from the past to the present tense, as if to signal his glee at the immediacy of it all. Yet his writing is as meticulous as ever.  Pretending to be the daughter of a brain-dead woman, Mrs. Donaldson breezily tells her pretend sister and a pretend doctor: “Let’s look on the bright side. If we switched her off, it would reduce her carbon footprint.” Watching her lodgers in flagrante, she feels “like a tennis umpire overseeing a particularly close-fought match” and wonders if she’s the first creditor to have been paid in this “tumultuous currency.”  That donnish figure in glasses is clearly in control. But he’s also cast off his repressions and let his louche side rip. And that’s a paradox to relish.  Â Benedict Nightingale is a former chief theater critic for The Times of London.
Alan Bennettâs new book brings together two novellas that celebrate several varieties of sexual activity involving respectable parents of adult children.