Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Buy only if you're not offended by gay porno film

I bought this book thinking that it would give a behind-the-scene look at the pornographic film industry. I did not expect it to be about a GAY porno film set.Many of the photos are fairly well taken in a documentary style and a few even managed to inject a bit of humour into the work of the cast and supporting crew, like a "gay" actor jerking off with a copy of Penthouse. Another "funny" photo shows a crew member looking away as two naked male actors hugged and French-kiss passionately off the camera. However most of the photos show how seriously the crew treat their work.But be warned, buy this book only if male homosexual pornography does not offend you. Otherwise, stay away.