Just because all he wanted to do right now was have sex. No, that wouldn't sound good at all. It was never supposed to be this way, he was supposed to be with Quinn because they were in love not because he was angry with her and had guilted her into it. "Just because I asked, you have more self respect than that, Quinn." Did she really? It seemed that anyone with Puck probably didn't have a whole heck of a lot of respect for themselves.
"It's not that at all Quinn, you know that. I want to, I really want to, I just don't... think it would be right." She was having Puck's baby after all, whether she knew it or not. That part was a definite turn off.