Of course, you can only get pregnant through vaginal intercourse, but you can get a STI through vaginal, anal, or oral sex. As a result, any sexual interaction requires protection. Using male condoms or dental dams during oral intercourse can assist you avoid catching a STI like HIV. Male condoms can help keep a STI from spreading during anal sex. Female and male condoms are both effective for vaginal sex, however they should not be used together.