I have caught my husband in the past with a prostitute. of course he denied it but I knew better. I made an appointment for both of us to see a doctor. after blood work---whammo he was positive for syphilis. and the worst part was he had infected us both. we got treated but the trust was never the same and the sex life basically gone. that was 5yrs ago. yesterday we had sex for the first time in like 3-4 months. afterward I noticed intact clear blisters on his inner thighs. he said they were heat related. I don't see him scratching, they are not bleeding or anything. I didn't see anything on his penis or around his anus. what could that be.