I can't answer this one. I find that different factors like hugging, kissing and cuddling are a lot more fullfilling and that's not with in my limited experience with zoo. Not that I don't want it, but my zoo experience has always been furtive and brief. So it just wouldn't be fair to compare the two.
I have had limited zoo experience in real life and lot's of human experience in real life, but I can't compare them. I've loved what limited experience I've had though, but I've loved some of my human experiences too..
Satisfaction in the singular act has always been there with the dogs, not so much with the humans.