Erm... thank you for the article, I found it very informative. But did you read it? From the conclusion:
at present, the evidence does not justify the denial of sexual motivation on behalf of the rapist.
The article is from 1988, so not the latest, and didn't conduct its own research so much as pointed out flaws in other research, but it did so quite effectively. Remember the claim I replied to:
Sex crimes are almost always about power and not about sexual gratification.
If that were the case, then why did Groth (cited as 1979a) find multiple quotes which he attributed to power but which explicitly expressed a sexual motivation, for instance:
I just wanted to have sex with her and that was that
(There's a more graphic quote as well which is more convincing but which I won't reproduce here). In examining the use of violence in rape, Geis (1977) reported that 78% of the rapists in the study "wanted the victim to cooperate", and similarly the Queen's Bench Foundation (1978) reported that 71.2% in their study "stated that they were hoping the victim would comply", 61.7% said "they had not intended to use violence."
The author cites a couple of instances of an argument that rape is about power and/or violence because it uses the vulnerability of the victim, which explains why the elderly are raped in spite of their assumed lack of physical sexual attractiveness, which would appear to contradict a sexual motivation. Yet the author points out that the age distribution of rape victims is inversely proportional to vulnerability, with young women being far more likely to be victims than are the elderly or children.
The most concrete counter-argument is that about recidivism rates amongst rapists who are castrated. If rape is simply a violent crime performed in a sexual way, then we would expect that castrating a rapist, while it might prevent future sexual violence, would not prevent the one-time rapist from enacting their violent tendencies in other ways. But the paper cites a Danish study which found that violent recidivism rates among rapists, once sexual crimes were removed, were 8.8% among those castrated, and 21% among those who weren't. It was a small study and was not recent when the paper you linked was published, but it is still quite powerful because it doesn't rely on reports by rapists nor on indirect evidence like demographic data.
Also, did you consider a thing can be both? One primarily wants to excert control and also gets off of it “on the side”.
Certainly - though this conversation has been crucial in understanding the depth of this aspect. But remember, I argued back against the claim that "sex crimes are almost always about power and not about sexual gratification."
I would say in light of the article you linked I am more certain now that that statement was wrong.