I have no idea actually.
Rape of men (by women or other men), even today, is still a big problem. I dunno the figures, but men who've been raped often won't come to the police etc (I know that's true of women who've been raped too, but I'm sure it's even more common among male victims). So I'm guessing historically it's been even more of an issue. I doubt many men who'd been sexually assaulted by their wives would have even admitted it back then, so I'm not sure how it would have been treated in law. Will have a look if I can find anything.