Patrick Kiser, whose team developed the gel at the University of Utah in Salt Lake City, says that the objective is to give women in countries where HIV is rife a cheap way to protect themselves from viruses and pregnancy even if their partner is unwilling to wear a condom.
Dilemma:
A. The gel has to be penetrable to enable unobstructed sexual intercourse.
B. The gel has to be impenetrable to prevent infiltration of sperm, HIV, and other sexually transmitted viruses.
Solution: Separation in Time (upon condition)
The gel is liquid as long as it is in contact with the acidity that is normal in a vagina, but will turn solid when it encounters semen, which is slightly alkaline. Any particles wider than 50 nanometres – including sperm, HIV and other viruses such as the herpes virus and the papilloma virus, which causes cervical cancer – are trapped.
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