While recently in Mexico, I had anal sex with a female sex worker(I am obviously male). I DID wear a condom, but it broke during intercourse. As soon as I realized the condom broke, I stopped anal intercourse and had oral intercourse to ejaculation. While I realize the risk of HIV and other STIs is low with insertion, could you please quantify my risk to HIV specifically and also other STIs? My exposure was 48 hours ago, does it make sense to pursue PEP given my circumstances? Thank you so much in advance for your service. 

 Your risk for STI & AIDS is far higher than your risk for HIV. For peace of mind I would suggest some point more than three days after your exposure you seek testing for gonorrhea and chlamydia.    HIV testing is not conclusive until 4 to 6 weeks after your exposure. Finally in the absence of sores or lesions, we strongly recommend against blood tests for herpes  because the herpes blood tests are unreliable and have a higher rate of false positive test results. 

 I hope these comments are helpful to you. If there are further questions or provide up to you to follow up responses to clarifying or additional questions.  EWH

IF your partner had HIV (statistically unlikely) the risk for acquisition on HIV is a little less than 1 in 100.  Thus I would estimate your statistical risk for HIV as being substantially lower that 0.1% (1 in 1000),

Again sorry for the typo.  EWH