A.K.A. the sperm blockers. These are a great first line of defense because they work by physically stopping sperm from getting to the egg during sex. Condoms are the ONLY barrier method that help prevent STDs. The catch? Used alone, they aren’t as effective for pregnancy prevention as other methods and you have to stop in the heat of the moment and make sure you use it correctly each and every time…. but being safe is sexy… and worth it!