http://yesmeansyesblog.wordpress.com/2010/03/19/affirmative-consent-as-legal-standard/
Ultimately, the matter of whether a woman consented or not will come down to a matter of belief by the jury. Simply moving to an affirmative consent standard does not prevent the accused from claiming that he asked permission and the woman gave it to him.
The article included a very interesting analysis of making "rape" into several "degrees" with different penalties - something many of us have discussed in other threads. I particularly liked this point in the article:
Dripp identifies another concern; that six months [for certain types of rape convictions] just does not do enough. He brushes this aside with the idea that consecutive sentences for repeat offenses, enhancements and sex offender registration will combine to impose punishment. Here, I think he’s basically right, but mostly for another reason. Lisak’s research shows that most rapes are by recidivist predators. Even if the sentence is short, an adjudication in the first case for a misdemeanor that could serve as prior bad acts evidence in a future trial would make it much, much easier for a survivor to get justice before a jury. Tagging them once, however lightly, would vastly increase the chance of taking the predators out of the population at some point before they reach their normal average of six victims, and would mark them as men to be avoided by targets that might otherwise get to know and trust them.
No, I don't think that works. You're trying to have rape be both a crime that's too minor to be fully protected, and sufficiently important to cause shame and disgrace. No matter what form the trial takes, the conviction rate will strive to match the age-old intuitive standard that extraordinary claims need extraordinary evidence. The more serious the perception of the crime, the more likely people are not to be convicted of it.
I find many of the arguments quite interesting, particularly the idea that affirmative consent as a standard would change public perceptions. However I think it fails on two fronts.
The first problem is that the article makes clear that non-verbal participation counts as consent, which puts us right back to square one. Going back to someone's hotel room, or getting very very drunk with them, could both be seen as enthusiastic participation. This does nothing to reduce the kinds of rape that the article is mostly talking about.
The second problem is that, despite the somewhat rosy picture painted of laws not being enforced in a typical situation, this is still criminalising ordinary behaviour. We can discuss whether it should be ordinary behaviour, but criminalising all such behaviour to aid prosecutions of cherry picked targets selected on the grounds other than whether they've broken the law is just an attempt to substitute subjective judgment by authority for legal grounds, and should be rejected on that basis.