Most condoms break because people carry them in their wallets for months at a time, being heated/cooled constantly cause the latex to become brittle.
Make sure to use condoms that are stored in regular environment (NOT a car/wallet/etc), make sure you dont use those you put in your pants and then accidently washed.
Chances are very good that your condom will work flawlessly (higher % than the pill). Just make sure to look at the expiration date (yes they have those) ... my ex made that mistake with a boy and had to take the emergency pill because it broke.
Trojans are a very dependable condom. As I said, take care of them and chances are very good the only thing that will happen is a very satisfying orgasm (or two).
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