I lost my virginity on camping trip -- Palin daughter reveals in memoirs
Bristol Palin writes in her new book of losing her virginity to boyfriend Levi Johnston on a camping trip after getting drunk for the first time.
She awoke in her tent, alone, with no memories of what had happened as Mr Johnston "talked with his friends on the other side of the canvas".
She had vowed to wait until marriage. And she had lied to her parents about where she was going.
Miss Palin, a 20-year-old single mother and the daughter of former Alaska Republican Governor Sarah Palin, tells a story of "deception and disappointment" in the book, Not Afraid Of Life: My Journey So Far.
Miss Palin's book covers growing up with her family, which she portrays affectionately, and the excitement of her mother's political life as governor and then, in 2008, as the Republican vice presidential candidate.
But the main theme is her on-and-off-again relationship with Mr Johnston, with whom she had a child and was briefly engaged while caught in a media spotlight.
She calls him "the gnat named Levi Johnston," a self-involved slacker "who cheated on me about as frequently as he sharpened his hockey skates".
But Miss Palin, self-described as a good girl and straight-A student, had been drawn to him and his bad-boy manner from the time they met in seventh grade.
When she confronted him about their sexual encounter, he said they wouldn't do it again until they were married.
It did not work out that way, though. Miss Palin notes that when she got pregnant she was on birth control pills prescribed to treat her cramps.
When she told her parents, they were accepting, not condemning, she writes, and focused on the future, particularly her continuing education.
Mr Johnston's reaction was less reassuring: "Better be a ******* boy," he declared.
Miss Palin writes of being awakened early one morning in August 2008 by her father, Todd Palin. He gathered the kids, collected their mobile phones and announced they were going on a surprise trip.
The destination was Dayton, Ohio, where, the next day, Arizona's US Senator John McCain, the Republican presidential nominee, introduced his vice-presidential pick and her family to the world.
By then, Sarah and Todd Palin knew their daughter was expecting. The public found out during the Republican convention, when Sarah Palin was shocked to see a TV network carrying an unapproved message from her commenting on it.