I am almost 15 years older and my assumption is that he's acting this way toward me because I am outwardly gay and a non-judgmental person and he needs someone to confide in. He's told me about guys in public hitting on him recently and how good it made him feel.
He says things that are explicit enough to be borderline inappropriate for work with an awkward giggle. And yet he speaks openly about going to gay bars, watching his gay friends hook up, and so on. He's totally gay acting, but there's a catch: he's married to a woman and he speaks frequently about his wife. He's a newish coworker-friend mainly because we never interacted during the pandemic isolation period.
I have an adorable coworker, about 30, who is gay, gay, gay. It's true, so save your 0/1000s for someone's story about his nephew.