The book's supposedly by Lawrence Block, so I'd hoped for a crime novel. This isn't one. It barely has a plot. I'd say 5 pages of plot and 185 pages of sex. Very disappointing. It does mention the movie The Sound of Distant Drums, a feature of Block's soft porn, so maybe he did write this.
Looking around the 'Net for something about the book, I ran across this post. It appears that College for Sinners is an almost exact rewrite of a book from about the same time, a softcore novel by Robert Silverberg. Why would Block copy a Silverberg book? I have no idea, but click the link for a comparison of the two.
While this was a big disappointment from the plot point of view, I'm now glad I have it because of the curiosity value.