Not once, not twice: Italian prosecutors have amped up their case accusing Prime Minister Silvio Berlusconi of paying for sex with an underage Morrocan girl, claiming that he had as many as 13 sexual encounters with the teen. The prosecutors pulled the number from a lengthy document obtained by the Associated Press that officially concludes a separate investigation against Berlusconi's aides who were accused of rounding up prostitutes for the Italian leader. The document contains details of evenings organized by the aides during which the prime minister hosted dinner before being treated to erotic dancing and having his choice of a sex partner or two or three. Berlusconi is scheduled to go on trial on April 6 for the triple offense of having sex with a minor, soliciting a prostitute, and abusing his political power to cover up the scandal. Both Berlusconi and the Moroccan teen Karima el-Mahroug, known as "Ruby," have denied any sexual interaction with each other.