When I was a wee lass (about nine years old) I had a boxer. I came from the shower, went into my bedroom, bent over to get my panties and the boxer licked me. He was neither forced, nor enticed, he just did it.

Of course, at nine, I was shocked. I jumped and turned abruptly to smack his snout, reprimanding him with "bad dog!"

I don't know if this disproves your idea, dude, but I am of the opinion that some dogs just do things like that. I can't tell you how many times a male dog humped my leg or stuck it's nose in my crotch. OMG! How terribly embarrassing.