Haven't noticed any significant sticky patches from Buddy, but he does drool a lot when he's excited, and that can make quite a mess of his
victim sweetheart (can't it Terri?
)
I'm with Rachel all the way on this one. If it bothers us we distract him, He never gets to our toys so that's not an issue. He sometimes develops a passion for his bed and when he does he drags it downstairs (it is on the landing, normally) and starts folding it in half etc. We just take it away and he forgets about it after a while.
To be honest, even if it was guaranteed to stop the humping I would still think very long and hard about invasive surgery for social reasons. I am saying this from the comfort of owning an infrequent humper though. I might look on it differently if it was constant!