Masturbating by rubbing your dickhole

I recently discovered a new way to masturbate: rubbing your dickhole. It takes a lot longer to build up to the orgasm, but it feels so intense its unlike anything I've ever tried. It is very hard to do, because your finger will get tired (I'm a gamer and my finger still gets tired!), and I've never even actually orgasmed by doing it, although I've gotten close. One thing to note: You will DEFINITELY need lube. If you don't have lube, spit works too. Try it out, tell me how it goes!