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Expert Q & A Answers About unprotected sex risks

Is it possible to get STDs in a monogamous relationship?

I had unprotected sex before I met my current partner. I’m the first and the only partner of the person I’m with now. I recently went to a clinic to get myself tested and I have no STDs. If my partner and I just stick with each other (for sexual pleasure), can we still get an STD through unprotected intercourse or through unprotected oral sex?

How long do I need to wait after sex to take a pregnancy test?

After having unprotected sex, how long should I wait before I can check whether I’m pregnant? What’s the best way to test for pregnancy?

Can I get pregnant if I have unprotected sex during my period?

I’m a 16-year-old girl, and I just had sex for the first time...and we didn't have a condom. He pulled out early...and I started to get my period that night. Is there a chance that I could get pregnant?

Do STDs ever develop on their own?

If I had sex with my girlfriend, and neither of us has a sexually transmitted disease (STD), can an STD form on its own? Also, I’ve had unprotected sex with my girlfriend using baby oil, and now I have little pimples or blisters on the bottom of my head of my penis. Could that be from the baby oil? Or could it be something else?