The person you are replying to is saying marital sexual assault did not have its own laws. Rather, it was prosecuted general sexual assault laws.
You are saying marital sexual assault did not have its own laws and it was NOT prosecuted under general sexual assault laws. For example, because the sexual assault laws had an exception saying the law does not apply if the perpetrator is married to the victim.
So, which one is correct? Did the law before 70's or 90's specifically exclude marital sexual assault? Or was it neutral and used for all sexual assaults, both within and without marriage?
We sometimes see laws covering things that are already covered, not changing things, but merely making them more explicit. In more recent memory, once can remember the debate surrounding Born-Alive Abortion Survivors Protection Act, which essentially aimed to criminalize something that was already criminalized by the existing statutes.