Male Dogs and their habits

My Cocker Spaniel has a bad habit of trying to hump my female dog every
chance he gets, they are both bixed and the vet says he might not stop this
behavior, she has kicked his ass and he stops for a little while but then
starts again, does anyone have some ideas on how to curb this behavior?

FurPaw...

Serious question for you and Matt: how do you train your
neutered males not to hump? Does shoving him off stop the
behavior, or just suppress it in your presence - that is, does he
continue to do it when he thinks you're not looking?

My experience with trying to train my males not to air hump
(before we just gave up) was that it's kind of like going after
garbage - the reward (or in this case drive?) is too strong to
overcome the effects of correction, so the most effective thing
is to not supply the opportunity (keep the garbage
unavailable)... But with air humping, "not supplying the
opportunity," short of putting the males into a doggie monastery,
wasn't an option. (For 10 years we had 2 neutered males and 2
neutered females.)

And we weren't successful at training an alternate, competing
behavior.

So what do you all do to train your males not to hump?

FurPaw...

No ideas how to curb it - your female may eventually be more
effective than you, anyhow.

My male chihuahua was neutered at 6 months, and at 14 - years,
that is - he still occasionally tried to hump my neutered female
chi. It was just air-humping over her, no attempted penetration.
She didn't seem to mind, just looked bored.

My male yellow lab (10, neutered at 6 months) also air humps
(from the side) now and then, usually directed at female dogs.

We don't let it bother us - we just laugh at him.