>>157117While you are jerking off, Rub your taint with the other hand. Press down close to the anus but far enough away to not get your hands smelly. I usually press down right where the clevage of my butt cheeks end. It should feel kinda good to do while you are masturbating. It takes time but if you make it a habit to do that then you'll eventually start having prostate orgasms. I masturbate lying down. It helps to spread your legs for some reason.
You can also rub the inside of your anus but taint massage is more convenient.