There are plenty of reasons why condoms break: “One common reason is not enough lubrication,” Dr. Raj says. “That can tear the condom and create little holes that you can’t feel.” Oil-based lubricants degrade rubber and shouldn’t be used with latex condoms -- pick water-based instead. It’s not just the little breaks you have to worry about, an obvious break may go unnoticed too, Raj says. An expired condom, or one stored improperly (read: in your wallet!), can both be reasons for an unwanted tear. Protect yourself by keeping your condoms in a cool, dry place because heat, air and light exposure increase the risk of a condom breaking.