'Reading '50 Shades of Grey' is acting like an aphrodisiac for women,' Linda Murray, Global Editor in Chief of Bab圜, told ' Good Morning America.' 'It's putting them in the mood more frequently and they're having more sex and they're ultimately getting pregnant faster.' Now the revolution is coming to the delivery room, where a baby boom sparked by the 'Fifty Shades of Grey' phenomenon is predicted. 'It was kind of erotic and sensual and loving and compassionate all at the same time, which kind of got my insides going, I guess,' one user wrote. The revolution has been whispered about among friends and spilled out online on discussion boards like those of the popular pregnancy and parenting website Bab圜. Elsewhere, they are said to have sparked a ' mommy porn' revolution. The books' contents - the relationship between protagonists Christian Grey and Anastasia Steele and their very explicitly detailed sadomasochistic sexual encounters - are so naughty they make grown men and women blush - at least in public. The erotic trilogy ' Fifty Shades of Grey,' 'Fifty Shades Darker,' and 'Fifty Shades Freed,' by British author E L James has sold 20 million copies in the last four months alone. It has made millions of readers swoon and gotten A-list actors to throw their names into the ring, hoping to star in the big screen adaptation. It's one of the hottest and best-selling book series of all time. ABC News' Felicia Patinkin and Amy Robach report:

Books series like 50 shades of grey