yeah, your dog is afraid of your significant other and is begging him to smell how submissive he is, your dog is trying very very hard to communicate that he is submissive, the more angry your significant other gets, the harder yoru dog will try to get him to see he is submissive to him- aka the worse the pee situation is going to get
when we very first adopted our dog 10 years ago, my DH could not even stand upright in the same room or use his normal voice without her getting submissive, within a month we had the entire thing turned around, I had to train my DH, the dog was speaking loud and clear
AND setting your dog up for success, why is he allowed on the sofa anyway? your dog also will feel more confident when he knows what the house rules are and what his job in life is
my favorite training videos
http://www.kikopup.com/Dogmantics/Home.html