A legit product that I sell during my day job might make you feel better. Not sure if I want to advertise my real business as the receptionists might be alarmed to get massageplanet.netite calls.
I sell a product that dispenses from a can like a mousse and it bonds to your skin and won't wash off until that layer naturally dies and falls off (a solid 4 hours). It provides a full barrier to an amazing list of harsh chemicals (nitric acid, etc), as well as a barrier to mucus, urine, blood, bacteria, and viruses.
Best of all its next to impossible to tell you are wearing it. No color change, no change to sense of touch, etc. The legit purpose it to protect medical workers in case of a glove tear, and secondary protection for people working with hazmat items.
I apply it about 1/2 hr before every appointment with a SP, or MP. Because it gets rubbed into the skin, I apply it to the shaft and balls to protect where the condom doesn't cover. It gives me peace of mind that I have less of a chance of catching something. I still wear rubbers of course.
PM me if you are interested and I can hook you up. Alternatively, if I get 1000 pm's I might throw up a webpage and advertise it on this site.