Honestly it depends on the game and the players. 
I'm a bit more profane than most, (though not awful) but I'll drop an F-bomb every once in a while.
I'm welcome to having you join, but I won't censor the others if they decide to swear.
I haven't encountered a GM that prohibits swearing, though I'm sure there are a few out there. 
Ask around, you'll definitely find a group that's meant for you.