Activities where this can happen include vaginal intercourse (both partners), anal intercourse (both partners), giving oral sex, sharing needles (IV, tattoo
etc.), and rarely through receiving a blood transfusion. HIV
can also be transmitted from mother to child. HIV is NOT transmitted through any form of casual contact.
In summary, in order for infection to occur, 3 things must happen:
1) You must be exposed to pre-***, semen, vaginal secretions, blood, or breast milk.