Don't be silly. "Pious catholic schoolgirl" ceased to be a thing some hundred years ago outside of porn videos. Today Poland might be "catholic bastion" on paper (i say on paper because half of these people never visited a church after their first communion and couldn't tell you all 10 commandments if asked) but heterosexual Poles know perfectly well what anal sex is. Same goes for the other "catholic bastions".
"Believe me" because i happen to be one of them, too.
That's one of the things characteristic of Catholicism, which even Catholics or ex-Catholics themselves seldom notice: superficiality of beliefs. It is a priest's job to know the Scripture and sermonize the believers, whose job in return to be sheep gone astray, always having a sin to confess. A deeper knowledge of the Bible is more of a Protestant thing and by Catholic standards, lax approach to the principles of faith is the norm rather than devoted, literal adherence to the Holy Word. We both know that these ultraCatholic devouts are being discreetly frowned upon by other 'normal' Catholics, who only go to church once or twice a year in their adulthood, be it Nativity play, Palm Sunday, a wedding, christening or funeral. Despite growing numbers of apostasies, the governing party of Poland is quite conservative and supportive of the Church, who still has a very special relationship with the State, just too cosy compared to other European countries. Hence, it still is a largely Roman Catholic country and perceived as such by our neighbours. Also, when it comes to kinky sexual practices, we are lagging behind them as well. I am aware that a lot has changed since the last time I moderated a sex discussion forum back in the early 2000s, but still a lot of stuff is either taboo or negatively stereotyped. One of such topics is anal, way too often associated with male to male sexual encounters.
