There are all sorts of unenforced, archaic laws on the books. There was a thread about this here somewhere once. I think I even posted some links. Do a Google search on "archaic American laws" or something. There is a variety of crazy bullshit out there. "It shall be illegal and punishable by two days of gathering hay on Mister Johnson's farm to wear blue clothing on Wednesdays," etc. However....
In some southern (and some western) states in the USA, some of the anti-sodomy laws ARE enforced, but usually selectively against gay people and not "good proper, married Christian folk." Believe it or not, it IS still illegal in some places for a woman to give her husband a blowjob or for him to fuck her anally. Until the people decide to push for the expunging of these laws, their vacancy from "the books," these things will linger out there for selective and arbitrary enforcement...
Barney Fife, anyone???