Pretty bad study tbh.
1) They offered extra-credit to those who would participate in the study. This is coercian and poor scientific practice as it skews the study population, unless you want to be making generalisations about "White, college majors who needed extra credit". This alone would have prevented it from being published in most academic journals, especially any British ones.
2) They used altered questionaires, based on outdated publications (Almost 30 years old? Come on). These questionaires are not validated as they have only used specific subsets from within them. For example, I would fall into the trap of "holding down women to coerce into sex". However, it was my girlfriend and I knew that she enjoys this. Would you state that "kissing a womans neck to coerce them into sex" is defined as rape? They have essentially tried to skew definitions to make conclusions.
3) I also disagree with the "no consequence" model being used. This is not defined correctly and again can be used to make poor correlations. In a true 'consequence free' world it would not be immoral to rape a woman because she would suffer no consequences herself.
4) Their conclusions don't really make sense (The only one they can really make is that there is an association between intention to rape and intent to use force) and this is shown by their fumbling discussion. They've essentially said, aha you've stated you wouldn't rape somebody but you've said here you'd use force to have sex! Well, good job but this doesn't show anything for the reasons outlined above. If I stated that I'd use any method to coerce a woman into sex, that is not the same as condoning rape.
5) Their sample size is small, probably why there are bugger all confidence intervals published in the data.
It's a reasonably average study because of the flaws in the data collection but the data analysis is pretty spot on, hence it's publication in a low impact, new journal and poor reporting. Hey ho, at least the Tab has linked the original study which should be commended.