If a person has been tested for the HIV and it is medically confirmed they have the HIV, what is that person's legal and ethical obligations to inform their potential sex partners of their HIV status? Isn't there also a moral obligation to inform others too?

When people 'freely' enter into a mutually consentual relationship such as having sex together, is there an implied or implicit (unspoken) understanding between the two that neither shall do harm to one another? Does the withholding of vital information (HIV positive status) violate the social contract between the two people?

Before you rush to judge, think first about the current debate on tobacco and the implications of withholding vital information from the public at large.

These qustions have a profound impact on our society in general and not just the gay community more specifically.