Nothing hotter than watching a male dog mount a hot guy. A great example of raw sex. it takes me back to the days when I was routinely involved with a male boxer. The boxer would hear me come home at the end of the day and I could tell that he greatly anticipated mounting me again. Generally I didn't take the knot from him but id one time from a smaller dog. I expected great pain but it wasn't too bad. I guess the smaller dog's knot was considerably smaller than my boxer's. I sure do miss those days.