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The news today features the best-selling book on Japan Amazon for the last week of January, called Otto no Chimpo ga Hairanai, or "My Husband's D**k Won't Go In". It has outsold Haruki Murakami's just-released and much-awaited new novel, "The Killing of the Leader of the Band of Knights" (our translation), with over 110,000 copies of "My Husband's D**k Won't Go In" having been snapped up to date.

Cover of "Otto no Chimpo ga Hairanai" ("My Husband's D**k Won't Go In")
Otto no Chimpo ga Hairanai is what is called a doujinshi (doh-jin-shee), literally, a "comrades' book," which is a genre of publication that started with aficionados of grossly erotic parodies of mainstream titles publishing them for each other - obviously in very small runs. However, with Otto no Chimpo ga Hairanai, the doujinshi genre seems to have made the leap to mainstream, much like the erotic novel Fifty Shades of Grey that caused a cultural storm in the West back in 2011.
The press release for this book by the publishing company, Fushosha, says:

"My Husband's D**k Won't Go In" is a shocking true tale that tells the story of a woman's life. 18-year-old Kodama hooks up with a freewheeling young fellow student at university. But something happens on the first night that they sleep together. He simply cannot get it up at all. But, following this, they put the impotence issue to one side, deepen their relation...