Joyce
I had about 15 responses and it appears very common with intact males, and even a few neutered males as well as a few females that participate in this behavior.
I found it interesting that Dana Scott had mentioned she believes this to be a hypersexual behavior.
One common occurrence is the "chattering" that occurs after licking of the female urine, an indication the male is recognizes this is female.
Reminds me of the National Geographic shows when a male lion wrinkles his nose ( Flehmen response) and opens his mouth when smelling female pheromones. This must be a similar response with intact male dogs especially. I think Dana is right about this being a hypersexual behavior, as there were a few responses (including Dana's dogs) who do not do this licking behavior.
All in all, it appears very common. Does make me wonder what the behavior is like with wild coyotes and wolves?