Before having sex with a condom, I use my penis to rub her vagina and?
What Im about to write next might seem stupid to many people but its amazing how many grown-ass adults dont seem to know this simple fact. Does the woman you had sex with have HIV or another infection? If she does not then there is no chance of you catching HIV or other infection. You cannot catch HIV or any STI if the person you are having sex with doesnt have HIV or other STI. You can have bareback sex with 10,000 people and if none of them have an STI then you cannot catch an STI. If neither of you know your STI status then you should probably both get tested anyway. Its a good policy for both partners to always get tested when a new sexual relationship starts. This brings me to my final point. A condom is not a magical glove that completely protects you from all forms of STI. You can still get infected with an STI wearing a condom, it just lowers the risk an amount from a great deal to somewhat depending on the STI. For example, a condom offers very good protection against HIV but fairly poor protection against herpes. Thats why its important to always get tested when you start a new sexual relationship.