What to do if i have only had sex with three guys two virgins &one who has had sex with idunno how many girls?

Confusing question: If you have no iron clad way of knowing their prior experience or know at least one of your lovers had many partners, accept that you may have been exposed to std's.Plan to see your obgyn for an evaluation every six months or sooner if any troubling symptoms arise. Some std's can reek havoc on your reproductive system with few if any symptoms.