About 30 hours ago, I engaged in mutual masturbation with a man of unknown HIV status.  After he came, he had semen on his finger and he rubbed my anus.  I'm concerned his semen from his finger got into my anus.  Am I at risk for HIV?  Should I start PEP?  

Welcome to our Forum.  There was no risk for HIV from this event, even if your partner did not have HIV and therefore there is no need for PEP.  Mutual masturbation, despite the fact that it is usual for partners to get each others' genital secretions on one another is not associated with risk for HIV.  Similarly, transmission of HIV (and, for that matter, other STIs) is not a result of transfer of genital secretions on one person's hands to another person. The organisms which cause these diseases are quite fragile and die upon exposure to the air. 

I see no reason for concern and no need for testing of any sort.  I certainly see no need for PEP from what you have written.  EWH

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Thank you for your reply.  So just to be clear, there is no risk of HIV transmission if the person who ejaculated was HIV positive, had semen on his finger, and then rubbed my anus with the possibility of semen getting into my anus?  If the semen got in my anus from this, would I be at risk?

Correct, you understand my reply.  No risk.  EWH---