"Norman Osborn (Seemingly.) took advantage of Gwen Stacy and Harry's girlfriend Lily (Ugh!), but that wasn't outright rape."
It wasn't any kind of rape, outright or otherwise. And Norman Osborn didn't take advantage of Gwen Stacy. He slept with her, pure and simple. They were two consenting adults who were single at the time and made the decision to have sex together. Until Norman tried to take custody of their children, Gwen didn't even seem to regret that decision.
In Lily's case, Norman was definitely manipulating her and taking advantage of her, but there was never any indication that their sexual relations were anything less than consensual. I guess you could argue that Lily was unable to give consent because she was insane from the Goblin Serum, but you could say the same thing about Norman too.
If you're manipulating someone into sex, or if you're taking advantage of them, it's not exactly consensual, no? I think that you can make that argument (At the very least.). It might not be outright rape, but you were using a tactic that wouldn't be considered kosher. So, yeah, I wasn't thinking of outright rape, but that whole thing with Lily was just creepy and wrong.