I always think of fucking as a specific kind of sex. The opposite of "making love," which is all sensual and compassionate. Fucking is raw and crass. It's about needs and pure animal desires. But that's just how I think of it, and I'm by no means imposing those definitions on others' usage of the word.
“As I am sure any cat owner will be able to tell you,
someone else putting you in a box is entirely different
from getting into a box yourself.” —bisexualbaker