 The Invisible Condom , developed at Université Laval in Québec , Canada , is a gel that hardens upon increased temperature after insertion into the vagina or rectum . In the lab , it has been shown to effectively block HIV and herpes simplex virus . The barrier breaks down and liquefies after several hours . As of 2005 , the invisible condom is in the clinical trial phase , and has not yet been approved for use . 
 The Invisible Condom , developed at Université Laval in Québec , Canada , <a href='drop_aux' title='1'><mark>is</mark></a>a gel <a href='null_relcl' title='2'><mark>that</mark></a><a href='uninflect' title='3'><mark>hardens</mark></a> upon increased temperature after insertion into the vagina or rectum . In the lab , it <a href='been_done' title='4'><mark>has</mark></a> been shown to effectively block HIV and herpes simplex virus . The barrier <a href='uninflect' title='5'><mark>breaks</mark></a> down and <a href='uninflect' title='6'><mark>liquefies</mark></a> after several hours . As of 2005 , the invisible condom is in the clinical trial phase , and <a href='been_done' title='7'><mark>has</mark></a> not yet been approved for <a href='negative_concord' title='8'><mark>use</mark></a> . 
The Invisible Condom , developed at Université Laval in Québec , Canada , a gel harden upon increased temperature after insertion into the vagina or rectum . In the lab , it done been shown to effectively block HIV and herpes simplex virus . da barrier break dwn and liquefy after several hours . As of 2005 , the invisible condom is in tdaclinical trial phase , and done not yet been approved fa no use .