That's not Catholic teaching. I'd hope you know that. Reasonable requests for marital relations must be honored; "I'm HIV+ and I gotta get some, so I'll wear a rubber and lesson your risk of getting a fatal disease a little bit" is not a reasonable request.
If you're saying it's a cultural thing, then I'd tell you that Christians sometimes need to rise above their culture.
You'd tell that to a woman whose husband is not Christian, or a marginal one at best?
What does she do to protect herself from a man who obviously doesn't care if he exposes her to the AIDS virus? I'm serious about this.
Is the Church reduced to just mouthing platitudes, patting the woman on the head, and telling her that "God will provide"?