Palle in canna! is a pretty good pornographic spaghetti western.
I'd rank it higher than a lot of regular spaghetti westerns.
Then of course there are also more drama oriented spaghetti westerns, gothic spaghetti westerns, trash westerns and, as Bill San Antonio pointed out, kung fu spaghetti westerns.
By the way, snow western? I can only think of one, maybe two if you count Cut throats nine, which is hardly a western at all.