When woman have a fight or wrestling match I have always there are numerous contests happening, many unnoticed. A clash between breasts, nipples erect, is certainly thrilling to watch. Contact would cause nipples to become erect but at the live events I have attended and also clearly seen on many recordings, when the ladies face each other listening to the referee and eying each other up, their nipples are already erect before any contact whatsoever. Presumably this is from the excitement they feel thinking of the battle to come. In topless wrestling and when strippers fight in the dressing rooms, the ladies state of excitement and maybe arousal is there to see. To me it would follow when women willing engage in a fight clothed, or even a heated verbal exchange, the nipples will be erect.