Yes they can if the sex was not protected. However it does not mean a person is guaranteed to become infected.
No; not if none of the 3 people were HIV positive.
If you're asking if a human being can get HIV/AIDS through sexual contact with a dog, the answer is no. HIV stands for Human Immunodeficiency Disease, thus it affects only humans. And I really, really hope this question was asked out of curiosity.
yes it is possible, but with every instance of sexual intercourse there is a possibilty you could contract HIV.
It is possible to have a false negative HIV test, particuarly early in infection with HIV. If a partner has a true negative HIV test, it's not possible to get HIV from them.
Assuming saliva only is on the cigarette and you pass it back and forth to smoke with a HIV positive person, no you can't get HIV when smoking with someone.
Only if the first HIV test was false positive can the test results change.
There is no risk at all unless you have unprotected sexual intercourse with that person or share needles.
There is no risk at all unless you have unprotected sexual intercourse with that person or share needles.
Women do not have sperm. If you're talking about a woman's vaginal secretions then yes it is possible and does on occasional occur during unprotected intercourse.
Sexual contact is the main way you catch HIV, yes.
No. Only a positive HIV test means you have HIV. Individual symptoms can be caused by any number of factors, not just HIV (not even just a virus). If you suspect you may have contracted HIV, you should seek medical advice IMMEDIATELY.
It is better to be HIV negative than HIV positive. An HIV positive person is infected with HIV.