Steven and Serena's already-complicated relationship takes another creepy turn when Steven pops the million-dollar question of "when were you going to tell me you've had sex with my daughter's boyfriend?" It sounds so much worse when you put it like that, Steven. This gives him the brilliant idea of discussing everyone they've ever been with. Uh, Steven, you sure you want to know? Though Serena conveniently leaves out her sex tape with Dan when recounting her sexual history, Steven's omission is much worse: he got it on with Lily. More on that later.