The legal side of rape is still an issue even today.
Men as victims of rape, non-penetrative rape, non-violent rape, rape within relationships and attempted rape of transgender people* - all are socially and legally subject seen as a grey area by many people. Or even as "not proper rape" at all.
It's not as simple as it should be. Of course, rape is rape, regardless of who does it and to whom. But that's not how people see it, and that's not always how the law sees it. So its still something that needs addressing. The legal aspect of marital rape was one of those.
*(eg the recent case in Sweden I think it was? - thrown out because the rapist hadn't realised his victim was transgender until he ripped her clothes off and then changed his mind... so got away with it initially)