Lol, oh my. I have to chuckle a little! Poor guy. Jackson has a few stuffed animals he loves too
namely too gigantic teddy bears that he goes at it with, but it's not an every day occurrence, sometimes his 'lipstick' doesn't even come out.... it's not always a sexual thing... dogs hump out of boredom, overexcitement, arousal, etc. If you don't want him doing it anymore, you may have to just pick up the beds, or at least every time you see him doing it tell him no. Usually I would say it's not a big deal so long as they are not humping other dogs, people, etc, but this sounds like a big problem!