Dropping the F Bomb

I've been thinking about the swearing my heroes do. My heroines, too, to some extent, but they never seem to sink into the depths of profanity that my guys do. When do I curb them or do I curb them at all?

No one's said anything to me, but the hero in the proposal I'm working on now goes farther down the road than any other hero I've had. It's not so much the frequency as his choice of words. I'm used to hearing the F bomb from my guys--they all use it, although in my first few books, I ce...