There's no sex in the first chapter except in the briefest most circumlocutory manner. In subsequent chapters sex will be sparse and and young content is off-stage and only described in dialogue.
Laura learns that her family has an incredible secret. She wasn't raped at a party while she was unconscious; she was introduced to sex at the age of 12 and the pregnancy just took nine years to catch.
Since she was 16 her libido has been through the floor but when her twelve year old daughter follows the same path, life gets interesting.