In "Elvis Presley: A Southern Life", Williamson also alleges that he cheated on his 15-year-old girlfriend Dixie Locke when he was 19, before ringing her desperately as he drove to the hospital when the condom broke, reports dailymail.co.uk.
Dixie and Elvis dated between early 1953 and October 1955.
Elvis reportedly had a string of underage women, including his wife Priscilla. The pair met in Bad Nauheim, Germany, during his army career when she was just 14.
That first night with Elvis, "he made love to her in every way short of penetration. It was as if Priscilla's virginity was another thing that Elvis strangely and sorely needed to maintain", the book claims.
When Elvis' mother Gladys died in 1958, his craving for companionship in bed became stronger, Williamson claims.
He says in the book: "There had been a river of sex before, now there was a flood." From 1958 until his death in 1977, he always needed a woman or girl in bed.
Williamson also claims Elvis was "obsessed with virginity", sleeping with two 26-year-old self-proclaimed virgins in August 1970.
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