Dines' study is a readable, accessible account of the dangerous direction that mainstream pornography is headed in. She nails a few myths about the industry which seem to be quite prevalent. Firstly, porn is a business: its about market shares and profit, although unlike selling popcorn, it involves exploiting (mainly) young girls for the benefit of middle-aged men. She is also very good at highlighting the fantasies that porn users construct to rationalise their porn use (in a manner not dissimilar to sexual offenders). Another myth of porn is that it is somehow progressive and liberating, although Dines shows, through the genre of 'inter-racial' porn, that porn exploits some of the most hackneyed and offensive racial stereotypes. One can take issue with Dines in some respects: what about porn made by women that is non-exploitative? This is a fair point, but any such porn that does exist is swamped by the nasty stuff, so Dines' point holds: she is talking about the mainstream, and it does appear that mainstream is getting harder and more extreme, pushing girls into more and more risky and dangerous acts (this is driven, of course, by the desire for profit, which must continue to recruit users who are jaded by the more 'vanilla' sexual practices). More worryingly, what does this increasingly violent mainstream porn say about society in general? How many more Josef Fritzls are out there? And what might the relation be between mainstream porn and a wider culture of sexualised violence?
One might make more rarified theoretical objections (what might the 'authentic' sexuality Dines calls for be like, for instance?) But this is nitpicking. Dines' main argument is sound, and it needs to be taken seriously.