Perry White
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http://www.medgadget.com/archives/2006/12/a_molecular_con.html
University of Utah researchers have developed a vaginal "molecular condom" that starts as a fluid substance to be inserted by a woman vaginally, that becomes a gel at body temperature and at the vaginal fluid pH of 4.2, and then in the presence of sperm with a pH of 7.7, it become a liquid again, only to release an antiviral drug load to block infection by the HIV.