theprestige
Penultimate Amazing
Ha, you edited between the time I first saw your post and click reply. You've clearly already figured out ponderingturtle is crazily enough correct. Now, no one gets charged with Adultery in Michigan, and it is very likely any such charge would lead to a Supreme Court decision ultimately striking down the statute in question. So just looking at the laws on the books, yes adultery is a felony and sex while committing a felony is 1st degree CSC. However when you consider that the law is de facto not in force, and likely unconstitutional to boot, it isn't really a felony.
Whether it's a felony or not, I initially misread the syntax of pt's post. Thus my reply did not address the point, and your reply addresses a point that I wasn't actually making, so I'm not sure what you've accomplished.