Just as an addition: the idea of wearing a condom is good. There are even special types that contain some chemicals that are supposed to numb the physical sensation such as "Trojan Extended Pleasure" or "Durex Performax".

However: NEVER use 2 condoms!!! The friction between them makes them likely to break them both!!!

If you are looking for additional safety to prevent a pregnancy, rather add anti-spermicide, diaphragm, etc., but never 2 condoms on top of each other.