In all my time writing Cass I have never known where she innately lay on the Kinsey scale, or even if that is a meaningful designation for her. I know she's Steph-sexual.

However, Steph wasn't the first girl Cass slept with. She met this gigantic tattooed redheaded woman once with whom she sparred as conversation and flirtation, and fell into bed with laughing in every inch of her body. Grace understood her silence, fed her for two days, and bought her another outfit before seeing her on her way.

Cass would've slept with Kon if he'd asked, but also understood that he was working out how to be her friend without necessarily sleeping with her, so she never asked.

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Steph is slightly hero-sexual, and knows this, and is okay with it, and it was just one more layer of glee in being a hero, not least in being Robin.

Cass wasn't the first girl Steph kissed, but definetely was the first girl she did more with.

Steph met and kissed Jason when she was twelve. That is totally in my personal backstory for her.

Bonus: There was this one sex-pollen story I never managed to write, which was Cass/Kon/Steph/Tim in varied and assorted combinations.