Disagree with the conclusion, and is what the experiment / bet is about.
More accurate to say, some self identified heterosexual males when considering sexual activity with someone of the same gender are prone to prejudices from peers, family, own discriminations, such that the idea of being a "certain way" is determined to be revolting.
The experiment I alluded to earlier, bypasses the prejudice, and deals specifically with what all, or most, heterosexual males (who like oral sex) claim they desire in that act. I think that experiment, when performed, would change minds of some, but not all.
Another way to consider things is to entertain idea that every partner a heterosexual has been with was previously a male (think sex change), but that information wasn't given to you. Admittedly, this is nowhere near the same point I made in the experiment, but for some, it actually is. Because, it would mean, some were / are actually "that way" and if reality was, "ex girlfriend called me up and said she was a guy before we met, but never told me during the relationship," I think certain heterosexual males would feel entirely violated and revolted by the sex they were engaged in. I'm not saying they'd convert, but the revolt would be, in many cases, equal to revolt you are speaking of.