I love Steven Universe to bits: its full of excellent queer representation, and two gay relationships are key to the story (series spoilers) that of Ruby and Sapphire and also Pearl was 100% gay for Rose though that wasnt requited. It also engages with abusive relationships really well on multiple occasions Jasper and Lapis Lazuli being the most obvious example, which is very much mutually abusive, but also Pearl/Rose to an extent and 1000% of how the Diamonds relate to others and each other.
Venture Brothers is also good for this: you have Al and Shore Leave as important gay characters who end up a really cute couple but also the aggressively sexual Colonel Gentleman in one of the commentary tracks, his voice actor says, in Col. Gentlemans voice, in relation to his disturbingly young twink boyfriend, something to the effect of: Kiki is so sexy, I want to slather him on toast and have sex with the sandwich! I choose to believe this statement is canonical. It also depicts a non-standard straight relationship: Brock winds up falling for muscular Wonder Woman knockoff Warriana and goes to her apartment under the effect of Billy and Petes God gas. He awakes there the next morning with a butt plug in his *very* sore ass. When she comes by later, he starts telling her No more butt stuff but is lassoed by her and chirps, I liked it!