Sorry, that really is the title of the book! And it’s kind of central to Mohr’s premise: that there are two axes of swearing, the ‘Holy’ and the ‘Shit’… or the profane and the obscene, or swearing and cursing — however you best see the distinction between “for God’s sake” and “for fuck’s sake”. She sets this up by discussing various different cultures (all familiar to a Western audience), starting with the Romans and Greeks (mostly the Romans), then moving to the development of Judaism and the rising importance of oath-taking… and then round the full circle back to obscenity.
It’s a fascinating history, though it really is brief when you consider the potential scope for investigating swearing throughout history. I found the chapter on the Old Testament Yahweh fascinating — Mohr charts the development of monotheism through the way oaths are taken and the importance of oaths in the Old Testament, and it makes a lot of sense. (Reassuringly, it’s also well-sourced, and includes quotations and examples.)
It was slower-going than I thought, when I look at my reading time records, but I found it very absorbing. My only complaint would be that the ending felt rather abrupt, even with the later postscript (which briefly discusses an analysis of swearing on Twitter). Recommended!