Reading the article I was surprised to know that female-to-female infection is quite rare. What makes female-to-female sex more "safe" than male-to-male sex? Any ideas?
http://www.sunstar.com.ph/breaking-news/2014/03/14/us-reports-rare-female-female-hiv-case-333038
http://www.sunstar.com.ph/breaking-news/2014/03/14/us-reports-rare-female-female-hiv-case-333038
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