Hey! My girlfriend and I have been having sex for probably about 4 months now. I've noticed here lately that after we have had sex that my testicals/scrotum gets itchy. It gets itchy to the point that they almost turn red like there's a rash. I was wanting to know if this is just irritation from not cleaning off really good after sex or if it is something I should look into? If I were to go to a doctor about this is there anything you can think of that I should specifically ask about or say?

Thank you!