This post has not been vetted or endorsed by BuzzFeed's editorial staff. BuzzFeed Community is a place where anyone can create a post or quiz. Try making your own!
The Rythmeter
This simple scientific device will help you prevent unwanted pregnancies the natural, God-fearing way.
Want to get your very own quizzes and posts featured on BuzzFeed’s homepage and app?
Become a Community Contributor.
Become a Community Contributor.