I'm curious as to why it upsets you. I think if that Rottie didn't like it it would rip his face off right quick (and a few other choice parts, I'm sure). Is it a whole lot different than humping goats or sheep? Men have been doing that since we domesticated animals. Some heterosexuals like whips and chains too, so, although it ain't my bag, it is not something I give any thought. What some people call sexual deviancy is normal human behaviour. Even those who protest loudly are some of the most deviant.