The Sensuous Man by “M” (Dell, 1971)
This doozy is really a find. Not only for the orgiastic, “Hey, baby, wanna see the inside of my van?” advice given by the mysterious “M” (who continuously refers to himself as a capital-S, capital-M Sensuous Man). Oh no. The book is a treasure for the underlined passages by some hapless previous owner. After awhile, I felt like I knew far too much about this poor bastard.