I don't know about the accuracy of those values as sourced from Wikipedia but I guess they seem plausible compared to the number of openly homosexual people I meet. I think that there's going to be bias from a non-uniform distribution of persons with most niche interests/fetishes (also applies to virtually any minority interest group) where there will be places of much greater density such as F95Zone. F95Zone is, as much as anywhere else on the internet, an echo chamber (somebody mentioned echo chambers earlier in the thread and I felt like while it is accurate it is also sort of a given; echo chambers are a nigh-ubiquitous facet of the internet)....
again, I think that why they're gay, mostly. 93% of men and 87% of women are straight, according to wikipedia. If your making a porn game to make money, making it gay would be absolutely gimping your own project.
I have to constantly remind myself that some of the discourse here is dominated by a very extraordinarily high concentration of niche interests that is not representative of the general population. Otherwise I'd come away from some of these threads convinced that billions of people are foaming at the mouth for the opportunity to e.g. inbreed (not going to try to list other fetishes but this one is so incredibly prevalent here that it's a safe example). As long as games provide options to avoid/disable such content while still being engaging I try to overlook it.