Silent mode not working

silent mode doesn't work on iphone 13 pro max cuz it doesn't mute the music or any other dirty or profanity videos's sounds. I wish you can mute all the sounds altogether as feature button or options where i can check to mute all the sounds. I don't want people to hear what i am watching or whatever. Especially my deaf friend didnt know that the sounds are on when he was watching porn on iphone 11. He said impossible. I had silent mode on. You too. I have same problem as his and told him that too. He turned his hearing aid on and was shocked and embarrased. We laughed! The point is even deaf people can't hear the sounds or needed them. It would be nice if Apple can update new interface with options to press mute all the sounds in sound setting. And also have battery charging problem too. I have to unplug/plugin repeatedly until it is charged