In the area on and between my inner thighs and testicles there is a red area which is only sore when I touch it but is also rather sensitive. I am unsure if it some type of rash or not. I wash my body thoroughly and have not come into contact with any chemicals. I had protected sex with my girlfriend a few nights ago, but we are the only partners either of us have ever had. Could it just be and irritated area or could it be some kind of infection?