Polish society appears much more conformist to me
Yes and no. 45 years of socialism strengthened that aspect of Polish society but there is some tradition of tolerated oddballs (manifesting as fussy pedants). And those born after 1995 are a good deal less rigid.
Outward apperances of respectability are still quite important in Polish society
During late communism and well into the 1990s and early 2000s discreet adultery was probably more socially acceptable than public platonic fraternization.
Do not, I repeat, do not get married until you've spent time around the prospective spouse's family and find them (and where they live) to be mostly tolerable....