ThirdQED answered Sunday August 30 2009, 8:18 am: There are many types of condoms. In this answer, I will assume that you are asking about "latex male condom" (most people use latex condom these days).
So, with that in mind:
Latex male condoms provide very good protection against HIV and discharge diseases (which includes gonorrhea, chlamydia, and trichomoniasis).
Other than that, condoms' protection against all other STDs such as HPV and genital ulcer diseases (which includes syphilis, chancroid, and of course, genital herpes, too) are questionable (or not very good).
This is because some STDs are much more easily spread than others. STDs such as herpes and HPV can be transmitted by contact with skin not covered by a condom.
Herpes and HPV are among the most common and the easiest to transmit. Herpes is the most common STD in the US, affecting 45 million people. You can get herpes and HPV just by oral sex, which, if become complicated, may lead to oropharyngeal cancers (which includes tumors of the throat, tonsils, and base of the tongue).
Also, condom has a failure rate of 10% to 15% for typical use, and 2% to 3% for perfect use. This is the rate out of 100 sexually active women per year. (For example: if the failure rate is 15%, then that means in one year, 15 out of 100 sexually active women will become pregnant.)
Perfect use means using a condom consistently and correctly every single time. Typical use take the possibility of human errors such as incorrect usage into account. Most people, especially teenagers, are typical users.
Best method to have sex without worrying about STDs? Both of you go to the doctor and have a check. If the results are negative, then you two can "enjoy your time" like bunnies without worry about STDs ;-)
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