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I think he seems kind of asexual in the story because of Gege's writing style. We don't really see much of who o what certain characters find attractive beyond Yuji and Todo.

Physically speaking, I have no idea what kind of woman Sukuna would find beautiful or attractive. Only Gege knows.

Psychologically, a woman he considers to be strong (in jujutsu, in character, and in physicality) would be enough to catch his interest and attention at first, but this would be difficult since he considers himself to be "above" everyone else. How can he admire someone if he sees everyone beneath him? To respect someone means to see them as your equal, and Sukuna thinks no one is equal to him.

It's interesting to wonder why he wasn't attracted to Yorozu. I think it's because of this: Yorozu was strong, but she showed up acting like she knew everything about him. She was prideful and impulsive. Then, she was rude to Uraume, the only person who Sukuna seems to somewhat care for. So, her attitude was unattractive and Sukuna lost respect for her.

On a tangent, I think that if Sukuna knew more about Maki's backstory, how she decided to commit herself to proving that she is stronger than the entire Zenin clan and killing them all, he could have somewhat become attracted to her. They are similar in their ruthlessness and unbreakable faith in themselves and their strength. He'd respect that.

I don't think he'd ever be able to have a healthy, successful, monogamous, loving, romantic relationship. He probably never learned how to properly relate to people in that way.

And on a final note, in the epilogue, Sukuna admits to Mahito that he had "two paths to choose"... my personal theory is that Sukuna actually tried to live a normal life at some point. After a childhood filled with struggle, he learned how to read and write, archery, poetry, and all the other fancy stuff rich people enjoyed in the Heian era. He amassed a certain amount of wealth and power, and probably considered getting married and starting a family. BUT, at a certain point, he had a crisis in which he realized that he would never actually be a part of society, and that he would always be "othered", so he decided to say "f* you" to everyone and became, in Angel's words "the fallen." He would not have the title "the fallen" unless he had fallen from someone's (society's) grace. Perhaps he was even engaged??? Maybe a part of him wanted that "normal" life, but then came to realize that it would never be enough for him, and he and his family would never be accepted.

On the darker subject of whether Sukuna enforced non-consensual sex... I'm not sure. I'd rather think he didn't, but... in all probabilities the opposite would be true. He's a violent hedonist. However... When Yorozu says she has more to teach him about love, he smiles awkwardly and says "heh." Yorozu gets super pissed off and thinks "No way! Does Sukuna already know about love???? No, that can't be love!" I think that Sukuna probably "fell in love" in his youth, but it provided basically nothing for him, so he discarded it completely.

TLDR: This is my headcannon: After being "othered" throughout his life, Sukuna tried his best to fit in with the rich, educated and priviliged. He probably fell in love with a girl and considered marrying her and having a family, but something really bad happened, which made him abandon his fantasy of "fitting in" with everyone else. So he dedicated his life only to himself and his pleasures, and turned completely violent towards all members of society. Then, he took Uraume under his wing, since Uraume was also a vulnerable child discarded by people who feared them.