Bumped is a 2011 novel by Megan McCafferty. When a virus makes everyone over the age of eighteen infertile, would-be parents must pay teen girls to conceive and give birth to their children, making teens the most prized members of society. Sixteen-year-old identical twins Melody and Harmony were separated at birth and had never met until the day Harmony shows up on Melody’s doorstep. Until now, the twins have followed completely opposite paths. Melody has scored an enviable conception contract with a couple called the Jaydens. Harmony has spent her whole life in religious Goodside, preparing to be a wife and mother. She believes her calling is to convince Melody that "pregging" for profit is a sin. But Harmony has secrets of her own that she is running from.A sequel titled Thumped was released in 2012.
Babies Make Everything Better: Subverted with cases like Melody's friend Malia, who had a mental breakdown after her child was taken away, or with Harmony, whose pregnancy by Jondoe opens up a whole new can of worms - hopefully to be addressed in the sequel.
Baby Factory: Teenage girls are encouraged to have as many babies as possible.
Childhood Marriage Promise: At twelve years old, Melody and her best friend Zen promised that if no one else turn up, they would conceive a child together. Zen still takes the promise seriously, but Melody laughs it off.
Everyone Can See It: Melody and Zen. Shoko teases her about making him her "everythingbut"; Harmony mistakes him for Melody's sperm donor; even her parents are suspicious.
Fawlty Towers Plot: Harmony answers the video phone for a sleeping Melody and is mistaken for her by Lib, Melody's Large Ham of an agent, who called to hook up his client with sperm donor Jondoe. Harmony, a sheltered country girl overwhelmed by Lib's pushiness and Jondoe's beauty, ends up impersonating Melody almost despite herself.
Free-Love Future: For teenagers at least; adults are implied to be more traditional.
Future Slang: All slang relates to pregnancy or reproduction, like "ectopic" meaning "lame", "terminated" meaning annoyed and "pregg" meaning baby.
Hidden Depths: Jondoe reveals to Harmony that he has his own Christian beliefs, and that he chose his profession out of a genuine wish to help would-be parents. Those depths get even deeper when Harmony eavesdrops on a conversion which implies Jondoe may have been lying all along.
Holier Than Thou: Harmony, though it is revealed that she is seen as a sinner in Goodside for not wanting to consummate her marriage.
A Man Is Not a Virgin: In full effect with most teenage boys, especially Jondoe. Subverted with Zen, who is considered an inferior specimen because of his height ("only" five foot seven) and, in some circles, his Chinese/South American DNA. He's also saving himself for Melody.
Mandatory Motherhood: Most teenagers are paid top dollar to have children for wealthy couples after the virus makes anyone over the age of 18 infertile. In fact, any form of birth control is illegal. Motherhood is celebrated by everyone, with girls being told that they are born to breed and are even able to wear "practice" bumps as accesories.
Memetic Sex God: Jondoe, in-universe, the most sought-after sperm donor in the U. S. or possibly the whole world.
Not So Different: Harmony and Melody discover this gradually throughout the book, as the "innocent Church girl" gets pregnant by her sister's intended sperm donor and the "perfect Surrogette" decides to remain a virgin, both trying to follow their hearts and make their own choices instead of following orders.
In a broader view, Goodside and Otherside - they seem like polar opposites (religion vs. science, arranged marriage vs. free love), but the scary thing is that neither of them takes individual choices much into account.