a sex worker gave me oral sex. She performed oral sex on me (a male) for a few minutes, with her putting my penis into her mouth. I did not ejaculate and asked her to stop. Please advise what is the risk of HIV infection? This was followed by vagina sex with condom. What is the risk of HIV infection here. Please advise, I am 17 and this happened in Bangkok where I had my holidays.

There is no evidence that HIV is spread through receiving oral sex. The fact that you did not ejaculate neither increases or decreases your risk.

Transmission of HIV can occur when HIV infected fluids (like semen, blood or vaginal secretions) come into contact with your mucous membranes (the urethra of your penis, your rectum, or mouth). If this doesn't happen during sex, then transmission is practically impossible.

Your penis only came into contact with your partner's saliva. Saliva is not implicated as a fluid that transmits HIV because the amount of infectious HIV in the saliva of infected people is small, and possibly absent.

Remember, sexual transmission of HIV is known to be spread through the following three ways:

1) Anal sex, receptive or insertive

2) Vaginal sex, receptive or insertive

3) Oral sex, receptive fellatio or insertive cunnulingus (transmission to the person whose mouth is on the genitals)

If your sexual behavior does not fall into any of the above categories, then it is unlikely that you will become infected through sexual contact.

The use of a latex or polyurethane condom for sex greatly decreases the likelihood of transmission. HIV cannot pass through the barrier that an intact latex condom provides, and both laboratory and human studies confirm this.

RMK