"he very rarely panders to the pleasures, even of Onan"

Well now.  Onan was a Biblical figure from the Book of Genesis.  According to the custom of the time, he was obliged to sleep with his brother's widow, Tamar, and provide her with offspring.  Any child conceived, however, would not be his legal heir; for this reason, he deliberately withdrew from Tamar before climaxing.  This meant his semen was 'wasted', which angered God so much that he killed him.  Poor Onan would no doubt be delighted to know that his name has since been lent to that popular seed-spilling exercise of Onanism - or masturbation.