Wow...the only thing I don't get is why you have to sleep on the couch if she doesn't like the way you initiate? I mean, if it was a funny or playful thing like - - (sound of buzzer) WRONG! You initiated wrong and now you get door number three - the couch! - - but it was just a game and not actually have to sleep on the couch...then maybe it would make more sense.
But I do agree with the guys that she is actually WANTING more sex and is having a hard time with the way you are initiating.
I also have to wonder, why didn't you ask her DIRECTLY why she came up with this idea, where she heard about it, what HER goals are in doing it...etc. In other words, why are men so avoidant to having actual direct conversations in a case like this? (I know "why", but I am just asking to try to get you to think). I mean, she is likely full on prepared to tell you exactly why...as most women are usually holding back words at all times that they'd like to tell you....so why not just ask her?