The "r*** theme" is quite possibly the longest enduring genre in JAV. One must assume that it must be one of the most popular and profitable for it to endure for so long. Even so called "consensual" titles has elements of it. For example:
ANAV-009
You can rationalize all you want that she technically didn't say yamete, but it's clear what the director is trying to convey.
MIAB-592
The word it refers to her. (japanese AI translation issues)
The big bad boss is asking a male subordinate to hold her head from the back to prevent her from running away.
White sleeve on left = boss
Dark sleeve on right = subordinate
However, it's not everyone's cup of tea, (despite the sheer prevalence that pervades virtually every title). The theme is literally sprinkled on virtually every title.
And even if it is one's cup of tea, they won't admit it, because it's the safer move in general.
DFE-024
After he fully trains her, she's finally ready to be passed around.
Correct me if I'm wrong, but isn't DFE-024 highly regarded by consensual throat enthusiasts? Well, as you can see, the theme no one admits to liking has completely pervaded it.
R*** Theme frequency? = high
R*** Theme profitable? = probably. I would imagine it's a fairly logical conclusion.
People who admit they like it? = 0
I can literally convey this point via subtitles on so many throat titles highly regarded by "consensual irrumatio" enthusiasts. The list of titles is endless.
Which is perfectly fine, and smart for people not admitting to it. No reason to. Just enjoy it in private, like everyone else seems to do.