Good and perfect. As it should be. I enjoy bottom sukuna way more than the big daddy dom role.
Gojo being the first time to be intimate with him is 🤌 chef kiss (Sukuna's theme is all about not needing anyone else but himself to be satisfied and also goes into the sexual dimension). So Gojo, being the first to being the closest to "reach" him is a big thing in their dynamic. I don't think he is THAT clueless, probably understands the goal/basics but would have a lot of trouble just going for it. Gojo would probably taunt/tease him and that could either go wrong or just entice Sukuna to keep trying, but eventually Gojo takes the reigns and pretty much guides him through it.
Now it's one of Sukuna's favorite activities, but not the only one.

This is too ambiguous 😭 idk I think I'll sound repetitive.
I don't think he's a sex freak bc to me he hasn't had his first time at all. It really sounds he dedicated his whole time into training and working his technique.
He is not a brute and he doesn't act like a mindless aggressive animal either. He enjoys a good fight with worthy opponents. He'd greatest strength in battle is his intelligence and how adaptable he is to different circumstances he encounters.
Doesn't need sleep perse but enjoys taking naps.
I don't think he'd hate all modern food, just junk food. A good meal is a good meal, doesn't matter the time.
I think he'd enjoy various kinds of music. Anything he likes, he keeps.
He's a poet. Just like he praised people who do well in battle, he'd also take his time to appreciate and comment on what he finds commendable in other people's work.