It is written down in their book by their prophet (pee be upon him). Rape of children part of the mohammedan religion along with murdering poets who write things you don't like.
I’m sure history-rewriter L Farrakhan hates the book ‘Arab Muslim World: Architect of Slave Trade in Africa’...
https://www.google.com/books/edition/Arab_Muslim_World/eWU_XwAACAAJ?hl=en
The prophet wrote nothing, he was illiterate