Putting aside the skewed article and the limited research that went into it, which has already been pointed out, the bottom line that has to be endlessly emphasized in this section is that any man having regular sex with other men is not straight, no matter they choose to call themselves. Full stop. Do not pass go.
While the reasons why they continue to call themselves straight when it's clear they are bi could be open to several interpretations, but I believe the primary one is due to stigma and self-perceived shame. This is unfortunate, as every person should be able to express themselves sexually without any judgment, however given both the homophobia in straight society and stigma of bisexuality even amongst some groups of gay men, their insistence on clinging to the label of 100% straight is in one way understandable, even if it means they are lying to their true self. One only has to look at some of the threads in this section of the forum to witness such pretzel logic firsthand.
Alot of these men also seem to feel they are preserving their "straightness" by using what they consider "loopholes", such as it somehow doesn't "count" if they only receive BJs or only top other guys. Only if they suck or touch a dick back or receive anal penetration is it consider a "gay act". Like I said, pretzel logic.
Another "Get out of jail free" card I see many of these "straight" men, both in and apparently outside of this site also use a lot is that somehow going on the downlow rather than having sex with another woman who is not their partner doesn't count as cheating. Sorry, but it does. Anyone stepping outside their relationship with another person and without the knowledge of their partner is committing adultery, period. The gender of who one is having sex with versus their committed partner is irrelevant.
These married men who are secretly having sex with other men are deplorable for that single reason. As is those gay or bi men who are servicing these "straight" men with the full knowledge they are married. I think given the popularity of this topic within this board, that blame is often overlooked as a potential homewrecker can be of any gender or orientation.
As far as you, the OP, being critical of the responses your thread has received, perhaps you need to think about the title you choose for your thread and the assumption behind it. By asking "Who can relate?" you seem to be feeding into and emphasizing the myth around these parts that most, if not all, straight men are "sexually fluid" and it will only take the right incentive to convince them to have sex of any sort with other men. If only truly straight men are answering your question within this thread, then exactly zero will be able to relate to the thesis of your article. No actual straight man can answer regarding the phenomenon of why do some men who call themselves straight have sex with other men, since if such men wanted extracurricular sex, they would simply seek out other women to have it with, not other men.
In which case, as already pointed out, they would still be deplorable.