Do polish couples live together in Poland before marriage?
No they don't, they live in separate apartments until every family member has been introduced to the other family members in the other family (even those living in the USA, Kazakhstan etc) then they wear black clothing and meet each other a last time before the wedding (similar to what you would call "date") but it's all very sad, we Poles are very sad people, just look at the Smolensk tragedy, we can mourn in a week!
Then when marriage is done we all eat each other!