I agree with Mike_no. Your query is about putting your mouth on something strangers have had their mouth on. This will not transmit the virus. HIV transmission takes place inside the hosts body, (unprotected vaginal or anal sex and injecting with IV drug needles). Saliva and air inactivate the virus.
Therefore, this is not a route of transmission.
Please abort your plan to test. You weren't at risk. HIV is not spread through casual contact or from an object, it is a sexually transmitted disease.
Below listed are risk of infection in adults:
1. Unprotected vaginal or anal intercourse.
2. Sharing IV needles with people who inject drugs.
Also, someone's sexuality has nothing to do with HIV. This virus is transmitted when any one is negligent or by an accident or simply unknowingly not using protection with people of unknown sero-status / people who have sex with multiple partner.