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Answer:
Spouses in such a marital scenario are undoubtedly in a challenging situation. However, the answer is not the use of condoms. The moral law is “latex-immune,” so even if it helps avoid contracting a sexually transmitted disease, a condom or other contraceptive means cannot protect our hearts and souls from the inevitable fallout of sexual misbehavior, including contraception by married couples in this extraordinary case.
Such couples may need to be supported in living a marriage of complete continence, i.e., as brother and sister. If needed, this option is not simply possible but preferable with God’s grace, which we can access through various means, particularly regular reception of the Eucharist and taking advantage of the sacrament of reconciliation, e.g., on a monthly basis.
In addition, I say may need, because the good news is that contracting AIDS is no longer the death sentence it once was:
Times have changed. Now, most people don’t die from the virus. Thanks to continuing medical advances in medications, HIV can now be seen as a chronic disease. People who have it can enjoy long careers, get married, and raise families.
For more on the problems of contraception, see this article and other material from Catholic Answers.
For more information on the effectiveness of chastity vs. the use of condoms to prevent the spread of AIDS , see this article that addresses the findings of Harvard University research scientist Dr. Edward C. Green, as well as this article and this one which also address Dr. Green’s research.