Are there any good home remedies that can prevent stds?

Using a condom. And making sure your partner does not have an std, once u are diagnosed with one u need the proper treatment and follow up to make sure it is gone.
Chastity belts. Anything you can come up with to keep someone from having sex. If your using those home remedies, and you never have sex (even oral, anal or digital) then you wont get an std. But if you have sex, there are no 'home remedies' to prevent infection. Sorry...