Go to the printer and have a life size carboard cut out of Ron Jeremy done, leave it at their fron door with a note pinned over the crotch telling them to keep it down or you'll going to have to come over and take matters into your own hands....only if she's hot of course!
Or go get one of those air horns in a can and let it loose about the time you think he is about to reach the mountain top...couple times and Pavlov's pecker should be all done!