Thank you for your inquiry. From what we gather from the question, you were asking about the risk of HIV transmission from saliva being spit on to your penis head. From the information given, this scenario is determined to be No Risk (transmission of HIV is not possible in the given scenario).
The scenario mentioned above does not meet the three components of the transmission equation. HIV is not transmitted by saliva, unless it is mixed with an HIV positive fluid such as blood (1). One study has shown that the hypotonicity of saliva actually lyses leukocytes and thereby interrupts virus multiplication, which means that saliva does not allow for HIV survival (2). In order for HIV to be transmitted a HIV positive fluid must have direct access to your bloodstream through an activity with little exposure to oxygen.I understand your concern, but you can be assured that there is no risk of HIV transmission from the scenario that you explained. Even receiving oral sex is classified as a negligible risk (meaning there is no evidence or no documented cases of transmission, only a theoretical risk under extenuating circumstances).
Recommendation: No need for HIV test with the scenario provided, refer to a healthcare professional for other health related questions.
AIDS Vancouver Helpline/Online, Rashell 1.) HIV Transmission Basics
If you are satisfied with the Helpline service, please consider Donating.
2.) HIV Transmission by Oral Secretions