Risks of unprotected anal sex versus vaginal?
I know that anal sex has higher chances of transmitting HIV for both partners.
What I haven't been able to find is if there are risks of unprotected anal sex not present on unprotected vaginal sex, and which are those.
The baseline would be a couple that regularly practices condomless vaginal sex (with other contraception methods). What new risks would them be exposed to when engaging on condomless anal sex?
I think "asume none of the partners have STIs" is a huge stretch medically speaking, but since that's a risk already accepted on condomless vaginal sex, I'm more interested on any other existing risks.
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Your scenario:
A couple regularly practices condomless vaginal sex (with other contraception methods). What new risks would them be exposed to when engaging on condomless anal sex?
You can contract the same sexually transmitted infections (STIs) via the anorectal route as vaginal (see Assi et al. 2014).
The only extra risk I can think of inherent in condomless anal sex is the risk of a Urinary Tract Infection for the person penetrating.
The anus is full of bacteria. Even if both partners do not have a sexually-transmitted infection or disease, bacteria normally in the anus can potentially infect the giving partner. Practicing vaginal sex after anal sex can also lead to vaginal and urinary tract infections. (WebMD, n.d.)
References
Assi, R., Hashim, P. W., Reddy, V. B., Einarsdottir, H., & Longo, W. E. (2014). Sexually transmitted infections of the anus and rectum. World Journal of Gastroenterology: WJG, 20(41), 15262. doi: 10.3748/wjg.v20.i41.15262
WebMD. (n.d.). Anal Sex Safety and Health Concerns. Retrieved from: www.webmd.com/sex/anal-sex-health-concerns
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