a fuck is an amorphous unit of measure who's quantity can apparently be modifided with colorful descriptions:

the fuck in i don't give a flying fuck carries more weight than in i don't give a fuck. Be careful not to fall into the trap of trying to lighten it too much by simply saying i don't fuck, because that'll just make you look silly and potentially lose dates.

The exception to this rule is whan one has only the time or the patience or controll to utter nothing but the all-powerful Fuck You.