Is my wifes dog gay?

Even both are males it has nothing to do with sexuality. They are showing dominance over the other. To at least slow it down you or your wife needs to be the alpha leader of the pack and put a stop to the behavior when ever it starts, At our house the dogs know I am the pack leader.when one of the dogs step out of line I will snap my finger that is our signal for our dogs to stop what ever they are doing that we don't like. I would snap finger then pull him off the other dog and firmly plan him on the floor telling him no unil he would repond to the snap. I never snap twice.. If no response I go to them and physically separately them firmly with one firm no. Repeat that until you get them to respond to you. I only took a day to get my dogs to respond.but they already knew when I said no I meant no.

It's a dominance thing, females do it as well. They are trying to establish dominance over the other dog.

Get a spray bottle of water, and squirt the dog in the face, while saying NO.

no the dog is not gay . humping is a dominants thing hes just trying to say he's the boss that's all