“When you have sex with someone, you are having sex with everyone they have had sex with for the last ten years.”
-- Former U.S. Surgeon General C. Everett Koop
Barrier Methods
Please Note: Birth Control refers to many methods which block fertilization (union of sperm and egg), often referred to as "contraception", or which prevent a conceived human being from achieving birth, such as the IUD. Many birth control methods will be highlighted for their effectiveness - or ineffectiveness - in the prevention of Sexually Transmitted Diseases (STDs/STIs)
Birth Control 
