to be straight from the situation you described there is no need to worry at all. i do understand your obsession. at the outset you cannot be sure that the poop that has spiked onto your penis belongs to hiv infected person. assuming the worst case scenario hiv will not spread through contact with the following body fluids. sweat tears saliva feces or poop and urine. for further information consult an internal medicine physician online --> <link>
does hiv spread through toilet sharing?