Actually CCN1000, on the other side of the spectrum, "protection", meaning condoms, really are about as successful at preventing HPV and other STD transmissions as they are at preventing pregnancy. My spouse is a chemist and tested condoms for years. A few years ago, the US gov't accepted a lower standard of condom (higher failure rate) from China to be sold in the US. 1 out of 4 condoms failing, is about the accepted rate in the US. This means if you have sex with a condom 4 times, you have a good chance of possibly becoming pregnant. STD's are also transferred orally, as well as by sex organs. How many people have you ever heard that slip on a condom for oral sex. From a logical standpoint, abstaining from sex is the most likely method of avoiding STD's. The problem grows exponentially with the number of partners you or a partner of yours has had. Here is a CDC link on the subject targeting the number of people at 50% who will have an STD at some time in their life. This number could potentially be somewhat understated because the presence of genital warts caused by some forms of HPV is, too my understanding, the only way of knowing a male has come in contact with it.
http://www.cdc.gov/hpv/