Similarly, epidemiologic studies have shown that condom use reduces the risk of many other STDs. Ensure that adequate lubrication is used during vaginal and anal sex, which might require water-based lubricants. However, many infected persons may be unaware of their infection because STDs often are asymptomatic and unrecognized. Thus, they are likely to provide greater protection against STDs that are transmitted only by genital fluids STDs such as gonorrhea, chlamydia, trichomoniasis, and HIV infection than against infections that are transmitted primarily by skin-to-skin contact, which may or may not infect areas covered by a condom STDs such as genital herpes, human papillomavirus [HPV] infection, syphilis, and chancroid. Incorrect use more commonly entails a failure to use condoms throughout the entire sex act, from start of sexual contact to finish after ejaculation. Condom effectiveness in reducing heterosexual HIV transmission. However, the exact magnitude of protection has been difficult to quantify because of numerous methodological challenges inherent in studying private behaviors that cannot be directly observed or measured. Condom use and risk of gonorrhea and Chlamydia: How to Use a Condom Consistently and Correctly Use a new condom for every act of vaginal, anal and oral sex throughout the entire sex act from start to finish. Inconsistent or nonuse can lead to STD acquisition because transmission can occur with a single sex act with an infected partner. Sexually Transmitted Diseases Treatment Guidelines, Consistent and correct use of latex condoms reduces the risk for genital ulcer diseases, such as genital herpes, syphilis, and chancroid, only when the infected area or site of potential exposure is protected. Consistent and correct use of latex condoms may reduce the risk for genital human papillomavirus HPV infection and HPV-associated diseases e. If you feel the condom break at any point during sexual activity, stop immediately, withdraw, remove the broken condom, and put on a new condom.