4. Muhammad approves Ali having sex with a captive girl taken in war and says he deserves more
In a sahih (authentic) hadith, Ali (Muhammad's cousin, son-in-law, and central figure of Shia Islam) took a captive girl from the war booty and had sex with her. When someone reported this, Muhammad said Ali deserves more.
From a credible hadith
"The Prophet (ﷺ) sent Ali to Khalid to bring the Khumus (of the booty) and I hated Ali, and Ali had taken a bath (after a sexual act with a slave-girl from the Khumus). I said to Khalid, 'Don't you see this (i.e. Ali)?' When we reached the Prophet (ﷺ) I mentioned that to him. He said, 'O Buraida! Do you hate Ali?' I said, 'Yes.' He said, 'Do you hate him, for he deserves more than that from the Khumus.'" Sahih Bukhari 4350