Whenever i'm aroused watching porn i feel discomfort in my stomach and have bowel movements in and around after the 10 minutes of watching , can i know what is my health problem ?

With sexual arousal certain hormones, including prostaglandins, are released. These can precipitate gi symptoms including nausea and intestinal cramping. Another possibility would be stimulation of the vagus nerve. If this is your only intestinal complaint, I don't think you have to undergo any gi consultation or gi testing, but consult a gastroenterologist for an opinion if you still have concern