Similar to condoms, dental dams prevent the spread of sexually transmitted infections (STIs) such as syphilis, gonorrhea, chlamydia, hepatitis, human immunodeficiency virus (HIV). However, they do not ...

During sex ed in school—if you even had sex ed—there's a good chance the big takeaway was something like this: Use condoms on penises during intercourse, or else your hookup will result in a ...