Condoms do help prevent pregnancy and sexually transmitted infections (STIs). Each year, 85 out of 100 couples who have sex but don't use any form of birth control get pregnant. That number drops to only 15 out of 100 when condoms are used. And no other method of birth control is as successful at protecting people against STIs as condoms.
It's much smarter to talk about condoms before having sex, but that doesn't make it easy. Some people — even those who are already having sex — are embarrassed by the topic of condoms. But not talking about condoms affects a person's safety. Using condoms properly every time is the best protection against sexually transmitted infections (STIs — even if you're using another form of birth control like the Pill.