Sara Montiel denied an affair with Juan Carlos but Queen Sofía, left with her and the king, allegedly found them in a compromising situation

Juan Carlos, the former king of Spain, is a sex addict who had hundreds of relationships even after marrying Queen Sofía, according to a new book.

Before his marriage in 1962, Juan Carlos, now 79, satisfied his needs with an astonishing variety of women, Amadeo Martínez Inglés claims. Juan Carlos I: the King of 5,000 Lovers, will be published in September. The author cites reports by Franco’s spies, which said that the future king had 332 sexual relationships while at military academy, “which is good for any actor specialising in porn films: four per week”.

On the eve of a state visit to Britain by his son, King Felipe, and Queen Letizia, reports about the book will be unwelcome publicity.

Juan Carlos was crowned