Because all the shit who happens in 'gay porn' is all about 'gay men', bisexuals need both visibility and accountability in their shit as well since they are the majority in the alphabet, both IRL and porn. UncutLoc is openly bi and not gay as a lot of people here are stating.
Also, Thiago got defensive when asked if he was bi, which is very telling but not shocking since he was married to a woman, has a daughter and likes bi porn.
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Actual gay men in gay porn are like unicorns objectively speaking. The word "gay" is used only for marketing purposes, nothing more.