I have noticed what I thought was a heat rash in my groin area, i.e my inner thighs and on the sides and bottom of my scrotum. Now in the past I have gotten heat rash in this area and I was informed that once you have gotten a heat rash in a specific area you are more likely to have it reaccour. This time however only seems to happen after inter course with my girlfriend. It itches like crazy and I just started using Cortizone 10 intense healing. The first couple of times I used the cream it noticeably got rid of the symptoms and the rash was all but gone. My girlfriend and I had intercourse last night and the rash seems to have gotten worse again despite using the cream. My question is is it possible that I am having an allergic reaction to her vaginal fluids, or her feminine products? I have never had this issue with any other woman I have ever slept with so I am at a loss. Not only that but how do I have that conversation with her stating the possibility of being allergic to her vaginal fluids? I really love this girl and I want to continue to have a healthy sex life with her, please help.