This is true if condoms are used correctly.
There is a 2% risk of pregnancy and also of sexually transmitted infections, if condoms are used incorrectly.
Genital herpes can possibly be transmitted when there are sores present, even if a condom is used, sex is best avoided completely during this time.
Better safe than sorry - if you are 19 or under you can get FREE condoms. Just join the C Card scheme. It's easy to register, free and confidential.