Okay, so. A girl who has never presented herself as anything but sexually casual approaches him to work on the duet together, making it clear that she thinks they could win this thing if they paired up. I don't think it counts as using him for his voice, thinking about it, because she would've slept with him even if they didn't team up (football team, remember) and he agreed to sing with her even before sex was a consideration. She treats him like she would any other guy she intended to bed, which would make him the envy of his future wheelchair basketball team, and then plans a reasonably romantic Lady and the Tramp dinner to celebrate their victory.

Unless you're a believer in soulmates or intend to save yourself for marriage (neither of which seems to apply to Artie), that's a pretty damn special first time.