If the interest is specifically in the terminology, an essay could examine how the adult industry uses highly specific descriptors (like "double") to market content through search engine optimization (SEO) and how that influences how gay men perceive their own bodies and sexualities.
You could write about the history of "tribes" in the gay community (e.g., bears, twinks, otters). gay twink double
"While the 'twink' label offers a visible identity within the gay community, the cultural obsession with 'doubling'—the pairing of near-identical youthful archetypes—reveals a complex intersection of narrow beauty standards, ageism, and the commodification of the male form in digital spaces." If the interest is specifically in the terminology,