I've posted in the expert forum on my situation already and have been assured that I didn't have an exposure. A few weeks ago I performed unprotected cunnilingus on an escort in Vegas, I received protected oral and protected intercourse. Now a few weeks later I have what appears to be a possible chancre on my lower lip. I now plan to be tested for syphillis. Since this encounter I've only had receptive unprotected oral from my GF. If I did contract syphilis, could it be transmitted through semen? I wore a condom during my time with the escort and have no sores or lesions on my groin. Any information about transmission would be appreciated.