(see related story on sex trial) Milan, May 13 - Prosecutor Ilda Boccassini told a Milan trial on Monday that she had no doubt about the truth of allegations ex-premier Silvio Berlusconi paid for sex with a young Moroccan who went by the name Ruby before she was 18. "There is no doubt that Karima El Mahroug (Ruby) had sex with Berlusconi and received the benefits of it," said Boccassini, who is set to present her request for a conviction for the 76-year-old media magnate later on Monday. "He knew the girl was under 18". Berlusconi and El Mahroug have both denied ever having sex. They both say money she received from the ex-premier was simply a gift.