5 People Who Died During Sex, and 100 Other Terribly Tasteless Lists, by Karl Shaw

I think the second half of the title sums it up pretty well. I'm pretty sure no book I've ever read uses the word 'anal' as much as this one does. Lots of "Not sure I actually wanted to know that". On the other hand, they are rather amusing lists. And random stuff unlikely to be found in the usual kinds of sources.