Well whenever this porn debate comes up it tends to gravitate towards pro-porn, libertarian arguments vs anti-porn humanist not just feminist arguments that look at the damage it inflicts on women and society in general. Perhaps taking this rom com analogy flawed as it is, would perhaps allow an alternate perspective.
My own personal position is that in principle I wouldn't have a problem with porn, because I do not have a problem with sex. I don't think there has to be anything wrong with either, but pornography does not exist in a vacuum. The pornography or erotic art that a society produces is reflective of that society.
The subject matter today seems to reveal deeply disturbing kinks and fetishes: youth, power & and control fantasies, heck even race seems to get caught up in it somewhere. Now I haven't done a systematic study of the subject, but it seems to me that the real issue is with an underlying problem in attitudes to sex and sexuality, if you removed that maybe porn would be fine, or perhaps would need to exist at all. Although without question with the prevalence of the internet pornography is potentially both cause and symptom.
Now the the rom coms throws up a very interesting dimension. Beyond the fact the boyfriend threw it in there fallaciously, because he was caught out there is one very obvious difference between the girlfriend watching the notebook and the boyfriends porn collection. One was hidden and one was on display. There is a correlation with threads on here on prostitution, page 3 and porn, precious few men who rush to the defence of these practices actually own up to being users of prostitutes, porn or page 3. Why is this unless there is some tacit awareness even if never spoken that there is in fact a problem?
Additionally in real life although this is hardly a study by any means, I don't see my male friends talking about that great piece of pornography they watched last week like they would an episode of Doctor Who, or a movie they watched. If there is truly nothing wrong with pornography why isn't this the case?