Never use two condoms together
http://stevestine.com/?author=4 Using two condoms together, either two male condoms one on top of the other or the female and male condom together, is a bad idea. Some people get the wrong idea that two condoms mean more protection.
Use one condom would protect against HIV infection has been tested reliably. On the other hand, there have been no tests confirming that using two condoms together leads to better protection against unwanted pregnancies or transmission of HIV or other STDs. Single condom used properly are 98% effective, even if they are not used properly, the success rate has been found to be as high as 85%. So, it is better to try to know the best way of using a single condom rather than trying two condoms together.