"I ... I'm the only person who thinks that Gwen Stacy sleeping with Norman Osborn makes sense, aren't I? *hangs head*"
I can see Norman having sex with Gwen to further fuck with Peter's head. Gwen having sex with Norman because he looked sad? Not so much. It's espicially wierd since, if I remember right, it's also implied that Gwen and Peter never had sex--so she'll put out with the father of one of his friends because he's sad, but won't do so for the love of her life?
I could see it retconed that Norman mind-controlled her or something and working well enough, but on it's own...yeah, made of fail.