yes of course. this is about negative feedback (https://en.wikipedia.org/wiki/Negative_feedback) in terms of statistical infection. People who infect each other and who will despite remain loyal to each other will not spread the infection. The child might and as well might not get infected (https://www.who.int/teams/global-hiv-hepatitis-and-stis-prog...) but this is transmission to the next generation. Also HIV positive parents could consider refraining from further procreation, once they noticed it (the infection), while maintaining their closeness and loyalty. This could break the infection positive feedback loop.