The other day at work a Pole arrived, we talked in english and at some point he said fuck. I was like nah man, as a pole you should say kurwa. He proceeded to explain how kurwa is a bad word giving me a few examples. "Yes but you can use fuck in the exact same way" so I repeated every example he made but replaced kurwa with fuck, he thought about it a moment and said I wasn't wrong. Then he started using kurwa a lot. I'm still confused about the situation.
@raccoon I guess foreign profanity hits different. I dunno how common kurwa is used among the Poles. Fuck is common in very casual settings among the English speakers, but otherwise it has a lot of power.