The following is an extract from a fatwa issued by the late Ayatollah Khomeini of Iran.
"A man can marry a girl younger than nine years of age, even if the girl is still a baby being breastfed. A man, however is prohibited from having intercourse with a girl younger than nine, other sexual acts such as foreplay, rubbing, kissing and sodomy is allowed. A man having intercourse with a girl younger than nine years of age has not committed a crime, but only an infraction, if the girl is not permanently damaged. If the girl, however, is permanently damaged, the man must provide for her all her life. But this girl will not count as one of the man's four permanent wives. He also is not permitted to marry the girl's sister."
read the full text of Khomeini's fatwa here