Bacterial Vaginosis (BV): Causes, Symptoms & Treatment It's National Condom Month. Condoms are pretty cheap, at most pharmacies, and when used correctly, highly effective at preventing pregnancy and sexually transmitted infections. If you always use one Can Condoms Cause Yeast Infections and Allergic Reactions? It's World #SexualHealth Day. Using male or female condoms correctly and consistently helps prevent pregnancy as well as HIV and other sexually transmitted infections. Looking after your sexual health is important