Is it wrong to ....

These posts about morality has reminded me of an interesting debate that occured in a Ethics class of mine. Our Professor asked if it was wrong to have sex with a dead body. Now, the thought of necrophilia is disturbing to most people, but it seems only out of taste. No one in class could come up with a valid argument against necrophilia and I would like to hear your thoughts on whether this act is wrong. I came up with one which I felt was rather weak but it was still the best that came up. So... your thoughts.