The woman in "Living in Sin" does not put a lot of effort into keeping up the household, but the man seems to put in no effort at all. This inequality is reflective of gender roles in the 1950s, when the poem was written. The inequality is also extended to the couple's relationship, since the studio is a metaphor for it. In both cases, the woman seems unhappy with her surroundings, and the emphasis of the speaker directs us to consider her plight. In short: bad times.
Although the woman in this poem does very little to keep up the home (the relationship), she does a whole heapin' heck of a lot more than the man does. This reflects the unequal roles of men and women when it comes to home and family matters.
Although the narrator is omniscient (all-knowing), he or she seems to have the woman's back, speaking from her point of view in the poem and therefore asking us, the readers, to take her side against Mr. Boring Jeans over there.