"A man can have sexual pleasure from a child as young as a baby.
"However, he should not penetrate. If he penetrates and the child is harmed, then he should be responsible for her subsistence all her life.
"This girl, however, would not count as one of his four permanent wives. The man will not be eligible to marry the girl's sister."
-- Ayatollah Khomeini
(Tahrirolvasyleh, Fourth Edition, Darol Elm, Qom)