If you are not planning on breeding...PLEASE have him neutered.
My little precious Mojo
had a blanket that he would "hump"...and he would only do that to his "love blanket". But, one day, he was bleeding from his wee-wee....it ended up being nothing major...he had rubbed a big sore spot on his wee-wee and it was blistered, but had burst. The vet strongly advised us to have him neutered, since we had no plans of breeding him....because there could be so many other complications to not being neutered. We had that done...he was fully recovered by the next day and he no longer humps anything!