Not the first time a gel has been tried, but admittedly what you're thinking of is a different concept. http://www.reuters.com/article/2013/03/04/us-hiv-gel-st

Not the first time a gel has been tried, but admittedly what you're thinking of is a different concept. http://www.reuters.com/article/2013/03/04/us-hiv-gel-study-idUSBRE9230UI20130304 http://www.reuters.com/article/2013/03/04/us-hiv-gel-study-i... edit: meaning that with gel, maybe the problem is actually a UI problem. :)