This is not new. Sex with corpses is legal in most of the US (in more places than anal sex, go figure), and is fairly common among mammals in general.
I personally think it should be illegal, but not for some twisted form of judeo-christian morality (as seems to be the case with most people).
My recommendation is for it being illegal is purely logical - while alive I pick who fucks me, and when. While I can't choose after death; nonenforcement of my rights does not constitute a waiver, therefor, you're raping (what's left of) me.