Detailed: How HIV is transmitted.

You can't "catch" AIDS; you only contract AIDS if you have HIV -- Read more about the difference between HIV and AIDS .
HIV can only be transmitted from an infected person to another through direct contact of bodily fluids such as:
- Blood (including menstrual blood)
- Semen / Cum / Precum / Ejaculate
- Vaginal secretions
- Breast milk
- Blood contains the highest concentration of the virus, followed by semen, followed by vaginal fluids, followed by breast milk.
Activities That Could Risk HIV Infection
- Sexual contact that involves semen, vaginal fluids or blood.
- Direct blood contact, particularly through sharing injection drug needles or 'works' (cotton, cookers, etc).
- Infections due to blood transfusions, accidents in health care settings or certain blood products are possible, although they are extremely rare.
- Mother to baby (before or during birth, or through breast milk)
- Sexual intercourse (vaginal and anal): Anal and vaginal intercourse are high-risk activities. In the penis, vagina and anus, HIV may enter through cuts and sores (many of
which would be very small and hard to notice), or directly through the mucus membranes.
- Oral sex (mouth-penis, mouth-vagina): There are cases where HIV was transmitted orally, so it's not completely without risk to have HIV-
infected semen, vaginal fluid or blood in your mouth. However, oral sex is considered a low risk practice. The virus can't survive well in the mouth (in semen, vaginal fluid or blood), so the risk of HIV transmission through the throat, gums, and oral membranes is lower than through vaginal or anal membranes.
- Sharing injection needles or works: Sharing needles or other materials used for injecting is considered a high-risk practice. Injection needles can pass blood directly from one
person to another if you share them. If a person with HIV injects with a needle then shares it with another person, the second person is at very high risk for getting HIV.
- Mother to Child: Mother to child transmission is now rare in the US and other developed countries because pregnant women who are
HIV-positive are normally given medications to prevent the fetus from getting infected.
However, it is possible for an HIV-infected mother to pass the virus directly before or during birth, or through breast milk. Breast milk contains HIV, and while small amounts of breast milk do not pose significant threat of infection to adults, it is a risk for infants.
Bodily Fluids that are NOT infectious:
Saliva /Spit
Tears
Sweat
Feces / Poop
Urine / Pee
That's when you touch someone's sweat, saliva, feces etc you won't get infected unless the person is an Ebola Patronizer.

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Source: Safs & Tbthealth