Even if you have the world's tinkiest dinky you're going to want an elongated bowl just to have some room for the pee to arc out so you don't piss all over your balls.
I'm really confused reading this thread. Why isn't it possible to just twist and tuck it left or right? I'm a dude and have never had a problem peeing sitting down on a round toilet.
Round seats are best because you can tuck your willy under the seat and there's no chance of it popping up. Also the cool ceramic underside of the toilet seat helps stimulate urine flow