[Question #2464] STD concern

43 months ago
Dear Doctors

Im a bi male from London who had two sexual encounters with men 2 months ago who both claim to be STD free.  1 i was a receptive anal l, 2 I was insertive anal, both protected. There was also oral unprotected sex both times. I also have a gf, a month later we had unprotected anal, vaginal and oral sex. I got tested yesterday and still waiting for results. However, my gf has missed her menstrual  period this month for the first time in her life and she is not pregnant. My question is as I am a bit worried. Do any std's cause a late or missed menstrual period?  Other than that she feels absolutely fine. Thank you very much for your response. 
Edward W. Hook M.D.
Edward W. Hook M.D.
43 months ago
Welcome to our Forum. I'll be pleased to comment.  Let me first complement you on your commitment to condom use during your encounters with casual sex partners.  I should add that while the highest risk activities you describe with your recent male partners is your insertive and receptive anal intercourse (which you did use condoms for), there is also a small risk of STIs from oral sex as well. 

Regarding your question however, there are no data to suggest that STIs, including HIV, would cause a person to have late periods.  There are a number of factors which can delay menstruation including stress (both physical and mental) but STIs are not know to do this.  If her menses does not occur soon, I would look for reasons other than STIs for the delay.  EWH
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43 months ago
Thank you very much for the reply. However, there is so much conflicting information online, on websites which seem to be handling the topic very seriously, it sometimes gets confusing. I wonder if I could get another question. How risky in terms of acquiring STD including HIV is protected anal sex, both receptive and insertive? 
Edward W. Hook M.D.
Edward W. Hook M.D.
43 months ago
The risk of acquiring STIs, including HIV vary from organism to organism and by sex act.  HIV transmission risk is best studied.  currently, the best calculations on HIV risk indicate the following risk of acquiring HIV upon having sex with an HIV infected partner:
Receptive rectal intercourse: About 1 infection per 100 sex acts
Insertive rectal intercourse: About 1 infection in 900-1000 sex acts
Receptive vaginal sex with an infected male:  About 1 infection per 1000-1250 sex acts
Insertive vaginal sex with and infected female:  About 1 infection per 2000-2500 sex acts
Performing fellatio on an infected partner:  About 1 infection per 10,000 sex acts
Receiving fellatio from an infected partner : Less than 1 infection per 10,000 sex acts.  To our knowledge there are no cases of HIV that have been proven to be acquired in this way.

Other STIs such as hepatitis B, gonorrhea and chlamydia are more infectious than HIV but there are less data.  Condoms reduce the risk of infection when worn throughout sex and when they do not break over 99% (probably closer to 99.9%).

With regard to the internet, I can assure you that you will find conflicting and often incorrect statements there.  I would stay off the internet.  EWH
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