It seems that if I stretch hard enough to feel a good stretch, with my grip just below the head of my penis, the head of my penis gets very dark red and the redness remains for a few days. I only squeeze as hard as is needed to get a good stretch. Is this just a necessary evil of stretching that everyone has to deal with? Or is there some way of warming up or modifying the stretch that will reduce the redness. I would rather not have it be obvious (by color alone) to my significant other that I am doing the stretching exercises.