Name the method for preventing STI's and pregnancy that is 100% effective?!
Question: please help me I vote you if you get this answer.
Answers: please help me I vote you if you get this answer.
Technically speaking, it's abstinence.
But to answer your question, condom would be the best method. Even though it is not 100%, it is closest you can get to 100% for both prevention of STIs and pregnancy. Its efficiency rate is about 99.5%. Basically, I think condoms would be your best choice.
Uhm.... abstinence maybe?
chastity?
virginity?
Not having sex!!!!