I have to laugh. It's hillarious when women expect their significant other to become blind just because they are attached to them. You aren't dead! Regardless of your gender, if you see something you find attractive you are going to look. I look at other men and women. I even point out attractive chicks to my boyfriend. I'd be concerned if he didn't look at other women actually.
I think you sleeping on the couch for a week because of this is a bit extreme. If I was you, I'd be one pissed husband to have to sleep on a couch for any reason. I don't care how mad either partners are, no one should ever have to sleep on a couch as "punishment".