The French do not fuck...they make love and also repoduce. I suspect because they respect the act (and have fewer sex hang-ups).

Fuck is a unique multi purpose word that has crept into many languages, unofficially.

I suspect the French don't have an official crude term like it.
You would have to seek out unofficial street lingo...that likely varies by area. I remember one crude word for it, but can't spell it...It is something like forier?

Here is a start, But, I suspect there are more.

The Uncensored French Language