Critically discuss two ways in which hiv/aids is, not noticeably spread through transactional sex and thus become socially unjust to the victim

I'm not sure if I understood correctly your question .
Two ways HIV/AIDS not spread through sex ...

By blood transfusion (there was a scandal in France and other countries in the eighties many people got HIV because of this ; it was called the scandal of contaminated blood...)

The other one could be a fight between two people with severe bleeding injuries; if one of them is HIV, it may contaminate the other one.
Or someone willing to help and look after a cut, if this person has a small cut as well, he may be contaminate by blood.

As blood is the only way of contamination, people have to be careful when helping someone bleeding if they are bleeding too.

Usually, in hospitals, dentists, they have to use gloves 

Hope I helped