yes they prevent infections like STI'S it used to be called STD's as it is not a disease.
Use protection during sex Condoms are the easiest, and safest.
To use protection when you have sex. Wear condoms.
They are probably referring to using protection (condoms, birth controls, dental dams) during sex - oral sex, anal sex, and vaginal sex.
condoms
condoms
Using condoms with another contraceptive method, for example birth control pills, every time you have sex for extra protection
When she doesn't have sex. Other than that there is no guarantee. Double protection, that is condoms and the pill is the next best way to avoid pregnancy.
Answer Don't engage in any kind of sex, unles it's protected sex this includes, oral and intercourse. Protection mean condoms and blood tests with the person you are going to have sex with on a regular basis.
condoms
condoms
Condoms
Depends. There are other methods that are more reliable WRT pregnancy. But condoms are the best protection against STDs.