Slapping of the cock, especially the underside of the tip can get my cock so very hard and I can even cum through a slapping technique, a great way to go from "where is my cock?" (when it has been forgotten all day during work, living in underwear) To..... OMG, it is throbbing, about to gush, hard as a steel rod HARD, I Love taking it from "Like I don't care about it at all" to OMG, I AM GOING TO CUM SO FUCKING HARD,,,,,,,,,,!!!!!