I just looked it up to confirm because I've only known it to mean butt sex, but the Wikipedia article on it agrees with you.

I don't think any of those states actually enforce those laws though, most likely because it would be difficult to get evidence of such acts. Just because the law exists in the books doesn't mean it's still upheld, tons of states have "dumb laws" that aren't enforced (you can't keep an alligator in a bath tub, you can't beat your wife with a stick thicker than your thumb, you can't drive on Sundays, etc...) but we're never removed because the process is too arduous.