Even restricting yourself to Spaniards, you'd find many using "follar" to refer to the deed in question, with "joder" having taken on so many other uses & meanings (dejate de joder, no me jodas, no te jode, se ha jodido, hay que joderse, etc., etc.). You'll hear priests and grandmothers using the word with nothing conjugal whatsoever on their minds. I've even heard the king of Spain exclaim "Jó" once or twice on TV.

Really! So it's gone the same way as French foutre. Having a blog is very educational. Thanks for the information.