*Euphemania: Our Love Affair with Euphemisms*

The author is Ralph Keyes and you can buy it here.  Here are three excerpts:

Yesterday's polite euphemism is tomorrow's prissy evasion.  "Cherry" was once considered more respectable than "hymen."  Now, just the opposite is true.  The former is thought to be vulgar, the latter decent.

And:

When the unfortunately named rapeseed oil had trouble competing with products that had nicer names, a Canadian strain low in saturated fat was dubbed Canola (i.e., "Canadian oil") in 1978 and has done rather well since.

And:

It used to be said that "Horses sweat, men perspire, and ladies glow."

Most of all, this book was…interesting.