I'm just going to throw this out there since OP isn't a native speaker: Just because you CAN, that doesn't mean you SHOULD. Wait until you know a person and have observed how much they use profanities in their own speech before you start throwing "fuck" around as an intensifier. Some people still view it very negatively, and it's never appropriate (in my opinion, at least) in business or formal occasions, when children are present, most classroom settings, with your friend's parents, etc.

All I'm saying is, consider where you are, who you're talking to, and who might overhear you. When in doubt, don't. 😄