Though my dog is 2 years old and intact (though he will be neutered beginning of next yr) he has NEVER been a humper. I have VERY rarely seen him try to hump anything, never an inanimate object. If either of my dogs do hump they immediately are reprimanded for it.
My intact male (mini poodle) has never even EVER marked in the house, I never had to train that out of him, he just never did it.