I am male and my nipples were bitten & sucked by a female sex worker and got injured, there was no significant bleeding or deep cut, only very small (1*2 mm) and superficial injury to the surface of the skin in the nipple. I can feel pain & burn if I apply alcohol on the wound. There was no any other sex like vaginal anal or oral sex with the sex worker, absolutely no.
I worry about the possible transmission of HIV or STI, my family doctor recommended that I should take PEP to ensure the safety. But I just doubt if I need PEP in such a situation?
It has been 36 hours past since this accident, I need to make decision as earlier as possible if I decide to take PEP.
Please help to advise!
Thank you for your inquiry. From what we gather from the question, you were asking about whether being injured by a bite could result in HIV acquisition. From the information given, this scenario is determined to be a negligible risk (There are no evidence or no documented cases of transmission). The Center for Disease Control reports that being bitten by an HIV person has a "very small number of documented cases [and] involved severe trauma with extensive tissue damage and the presence of blood. There is no risk of transmission if the skin is not broken." 
- Center for Disease Control: https://www.cdc.gov/actagainstaids/basics/transmission.html
AIDS Vancouver Helpline/Online, Sara