Arch, just keep the fuck out, we don't need the pot stirring.
As for "academic studies", who the hell is going to go around asking rape victims "hey, I'm doing a study, do you like BDSM?". Because that damn-well would be insensitive, and it's hardly a world-shattering question to answer. I doubt such studies exist, and if you're seriously suggesting that Lantz should go out as a private citizen and try to make such a study and get it peer-reviewed then I am just going to laugh at how utterly ridiculous you are being.
So, he's relying on information from personal friends and the like, which, whilst not absolute proof of his opinion, is still enough to allow him to legitimately bring it up. And, BTW, I made the exact same damn statement (before Lantz did, in fact), so if he is wrong to say it then so am I....
Sorry, but if someone says "rape victims don't like BDSM" it is entirely reasonable to say "actually, yes, some of them do". I don't see how that is even a particularly controversial statement, and it is entirely relevant to the discussion given Sakura's backstory. Perhaps this entire argument should have been avoided, yes, but that is no excuse for continuing it by demanding actual academic studies which Lantz obviously doesn't have, and nor should Lantz be expected to retract his opinion just because he doesn't have firm proof for it. As he and I both said, X is entirely justified in saying "I don't believe it" on that basis, but since Lantz isn't bothered about convincing anyone I don't see the problem.