My Jimmy is a 6-year-old Aussie shep/black lab mix, and he’s been neutered since he was a wee, wee pup. But sometimes, when you get to loving him and stroking his ears and head affectionately, he… responds. He starts doing the Humpty Hump in a circle around the livingroom until he bumps up against something… or someone. And he just loves company.
When I first saw this thread, I said to myself “Self,” I said, “before too long, someone is going to come in here and make a good joke about the ‘furry’ aspect of the thread title. And I think that someone is gonna be Tentacle Monster.”
I, of course, heartily agreed with myself.
Well done, TM. 
My cat did the same thing a few weeks ago. I think it was his revenge for my decision to have him neutered.
Sure, laugh. You didn’t have to listen to him talk about yiffing during the toast to the newlyweds.